Exhibit 3
                                                                     ---------

                            PENN OCTANE CORPORATION




                 ____________________________________________

                         REGISTRATION RIGHTS AGREEMENT
                 _____________________________________________


                         REGISTRATION RIGHTS AGREEMENT


     This  Registration Rights Agreement (this "Agreement") is entered into as
of  the Closing Date (as defined herein) by and among Penn Octane Corporation,
a  Delaware  corporation,  and  the  persons  whose  signatures  appear on the
execution  pages  of  this  Agreement.

     This Agreement is entered into pursuant to the Purchase Agreement between
the  Company and each of the Purchasers listed (the "Purchase Agreement").  In
order  to  induce  the  Purchasers  to  enter into the Purchase Agreement, the
Company  has  agreed  to  provide  the  registration  rights set forth in this
Agreement.    The execution of this Agreement by the Company is a condition to
the  closing  under  the  Purchase  Agreement.

     The  parties  hereby  agree  as  follows:

1.          Definitions
            -----------

     Capitalized  terms  used  herein  without  definition  shall  have  the
respective  meanings  set  forth  in  the Purchase Agreement.  As used in this
Agreement,  the  following  terms  shall  have  the  following  meanings:

     Closing  Date:    The  date  on  which the Closing occurs pursuant to the
     --------------
Purchase  Agreement.

     Exchange  Act:   The Securities Exchange Act of 1934, as amended, and the
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rules  and  regulations  of  the  Commission  promulgated  thereunder.

     Losses:   The term "Losses" shall have the meaning set forth in Section 6
     ------
hereof.

     Placement  Agent:    Pennsylvania  Merchant  Group  Ltd,  a  Delaware
     -----------------
corporation.
     ------

     Prospectus:    The  prospectus  included  in  any  Registration Statement
     -----------
(including,  without  limitation,  a  prospectus  that  discloses  information
previously  omitted  from  a  prospectus  filed  as  part  of  an  effective
registration  statement in reliance upon Securities Act Rule 430A), as amended
or supplemented by any prospectus supplement, with respect to the terms of the
offering  of  any  portion  of  the  Registrable  Securities  covered  by such
Registration  Statement  and  all  other  amendments  and  supplements  to the
prospectus, including post-effective amendments, and all material incorporated
by  reference  or  deemed  to be incorporated by reference in such prospectus.

     Purchase  Agreement:  The Purchase Agreement by and among the Company and
     --------------------
the  Purchasers  thereunder  pursuant  to  which  the  Warrants  were  issued.

     Registrable  Securities:    All  shares  of  Common  Stock  issuable upon
     ------------------------
exercise  of  the  Warrants,  plus  any Common Stock issued or issuable to the
Purchasers  in  respect  of  the  Warrant Shares, pursuant to any stock split,
stock  dividend,  recapitalization,  or  similar  event.  The Warrants are not
Registrable  Securities  hereunder.    As  to any Registrable Securities, such
securities  shall  cease  to be Registrable Securities when (i) a registration
statement  with  respect  to  the  sale  of  such securities shall have become
effective  under  the  Securities  Act  and  such  securities  shall have been
disposed  of  pursuant  to  such  effective  registration statement, (ii) such
securities  shall  have  been  distributed pursuant to Rule 144 or any similar
provision then in force, under the Securities Act, (iii) such securities shall
have  been  otherwise  transferred,  new  certificates  or  other evidences of
ownership  for  them not bearing a legend restricting further transfer and not
subject  to  any  stop  transfer order or other restrictions on transfer shall
have  been  delivered  by  the  Company  and  subsequent  disposition  of such
securities  shall not require registration or qualification of such securities
under  the  Securities  Act or any state securities laws then in force or (iv)
the  sale  of  such  securities  by  a  Purchaser  shall  no  longer  require
registration  under  the  Securities  Act or such securities shall cease to be
outstanding.

     Registration  Expenses:   All reasonable expenses incurred by the Company
     ----------------------
in  complying  with  Section  3  hereof, including all registration and filing
fees,  printing  expenses,  fees and disbursements of counsel for the Company,
and  blue  sky  fees  and  expenses.

     Registration  Statement:  Any registration statement of the Company which
     ------------------------
covers  any  of  the Registrable Securities pursuant to the provisions of this
Agreement,  including  the  Prospectus,  amendments  and  supplements  to such
registration statement, including post-effective amendments, all exhibits, and
all  material incorporated by reference or deemed to be incorporated reference
in  such  registration  statement.

     Restricted  Securities:    The  Warrant  Shares  upon  original  issuance
     -----------------------
thereof,  and  at all times subsequent thereto, until, in the case of any such
security,  it  is  no  longer  required  to  bear the legend set forth on such
security  pursuant  to  the  terms of the security, the Purchase Agreement and
applicable  law.

     Rule 144:  Rule 144 under the Securities Act, as such Rule may be amended
     ---------
from  time to time, or any similar rule or regulation hereafter adopted by the
Commission  (excluding  Rule  144A).

     Shelf  Registration  Period:   The term "Shelf Registration Period" shall
     ----------------------------
have  the  meaning  set  forth  in  Section  3  hereof.

     Shelf  Registration  Statement:   The term "Shelf Registration Statement"
     -------------------------------
shall  have  the  meaning  set  forth  in  Section  3  hereof.

2.          Securities  Subject  to  this  Agreement
            ----------------------------------------

     The  securities  entitled  to  the  benefits  of  this  Agreement are the
Registrable  Securities.

3.          Filing  of  Shelf  Registration  Statement.
            ------------------------------------------

     (a)       If the Company shall receive from a Purchaser at any time prior
to  the earlier of (i) ninety (90) days after the closing of a public offering
of  debt  or equity securities of the Company resulting in net proceeds to the
Company  in  excess  of  $5 million, and (ii) June 30, 1998, a written request
that  the  Company  effect any registration on Form S-3 or another appropriate
form  with respect to all or a part of the Registrable Securities, the Company
will:

               (i)          promptly  give  written  notice  of  the  proposed
registration  to  all  other  Purchasers;

               (ii)       as soon as practicable, use its best efforts to file
with the Commission and use its best efforts to cause to be declared effective
under  the  Securities  Act,  a  shelf  registration  statement  (the  "Shelf
Registration  Statement")  relating  to  the offer and sale of the Registrable
Securities  by  the  Purchasers  from time to time and set forth in such Shelf
Registration  Statement;

               (iii)         use its reasonable best efforts to keep the Shelf
Registration  Statement  continuously  effective  in  order  to  permit  the
Prospectus  forming  a  part  thereof  to be usable by Holders for a period no
longer  than  three (3) years from the date of this Agreement, or such shorter
period  that will terminate when (x) all the Registrable Securities covered by
the  Shelf  Registration  Statement  have  been  sold  pursuant  to  the Shelf
Registration  Statement or otherwise, or (y) the date on which there ceases to
be outstanding any Registrable Securities (in any such case, such period being
called  the  "Shelf Registration Period").  The Company shall not be deemed to
have  failed  to  use  its  reasonable best efforts if such Shelf Registration
Statement  shall  cease  to  be  available  for sale of Registrable Securities
during  the requisite period because such action is required by applicable law
or  because  such  action  is taken by the Company in good faith and for valid
business  reasons  (not  including  avoidance  of  the  Company's  obligations
hereunder), including any financing, the acquisition or divestiture of assets,
corporate  reorganization  or other material transaction involving the Company
so  long as the Company as soon as practicable thereafter takes such action as
would  again  permit the sale of the Registrable Securities in accordance with
the  requirements  of  the  Securities  Act;  and

               (iv)      prepare and file with the Commission such amendments,
including  post  effective  amendments, to the Shelf Registration Statement as
may  be  necessary  to keep such Registration Statement continuously effective
for  the  applicable  time  period;  cause  the  related  Prospectus  to  be
supplemented  by  any required Prospectus supplement and as so supplemented to
be  filed pursuant to Rule 424 (or any similar provisions then in force) under
the  Securities  Act; and comply with the provisions of the Securities Act and
the  Exchange Act with respect to the disposition of all securities covered by
such  Shelf  Registration  Statement during the applicable period set forth in
such  Shelf  Registration  Statement as so amended or in such Prospectus as so
supplemented.

     (b)          Priority  on  Shelf Registration.  If any of the Registrable
                  --------------------------------
Securities to be registered pursuant to Shelf Registration are to be sold in a
firm commitment underwritten offering, and if the managing underwriters advise
the  Company  and  the  holders  of  such Registrable Securities that in their
opinion  the  amount  of  Registrable  Securities  proposed to be sold by such
holders  in  such  offering exceeds the amount of Registrable Securities which
the managing underwriters believe can be sold in such offering, there shall be
included  in  such  firm  commitment  underwritten offering the amount of such
Registrable  Securities requested to be included in such registration which in
the  opinion  of  such  underwriters  can  be  sold,  and such amount shall be
allocated  pro rata among the holders of such Registrable Securities requested
to  be  included  in  such  registration  on the basis of the number shares of
Common  Stock  represented  by Registrable Securities requested to be included
therein  by  such  holders.

     (c)          One-Time  Demand  Registration Rights.  The Company shall be
                  -------------------------------------
obligated  to  use  its  best  efforts  to  file  and  to cause to be declared
effective  under the Securities Act with respect to the Registrable Securities
one  Shelf Registration Statement.  Any Purchaser whose Registrable Securities
are  not  covered  by  such Shelf Registration Statement shall have no further
demand  registration  rights  under  this  Agreement.

     (d)          Mandatory  Registration.    If  the  Company  should  file a
                  -----------------------
registration statement under which the Registrable Securities are eligible for
registration,  the Company may satisfy its obligations under this Section 3 by
allowing  the holders of the Registrable Securities to include the Registrable
Securities  in such registration statement and complying with subclauses (i) -
(iv)  of  clause  (a)  of  this  Section  3.

4.          Holdback  Agreements.
            --------------------

     (a)     Restrictions on Public Sale by Holders of Registrable Securities.
             ----------------------------------------------------------------
Each holder of Registrable Securities whose Registrable Securities are covered
by  a  Registration  Statement  filed  pursuant to Section 3 hereof agrees, if
requested  by  the  managing  underwriters in an underwritten offering (to the
extent  timely  notified  in  writing  by  the  Company  or  the  managing
underwriters),  not to effect any public sale or distribution of securities of
the  Company of any class included in such Registration Statement, including a
sale  pursuant  to  Rule  144  (except as part of such underwritten offering),
during  the  10-day  period  prior to, and the 90-day period beginning on, the
effective  date  of  any  Registration  Statement.

     The  foregoing  provisions  shall  not apply to any holder of Registrable
Securities  if  such  holder  is prevented by applicable statute or regulation
from entering into any such agreement; provided, however, that any such holder
                                       -----------------
shall  undertake  in  its  request  to  participate  in  any such underwritten
offering  not  to  effect  any  public  sale  or  distribution of the class of
Registrable  Securities covered by such Registration Statement (except as part
of  such underwritten offering) during such period unless it has provided five
(5)  business  days  prior  written notice of such sale or distribution to the
managing  underwriter  or  underwriters.

5.          Expenses  and  Procedures.
            -------------------------

     (a)       Expenses of Registration.  All Registration Expenses (exclusive
               ------------------------
of  underwriting  discounts  and  commissions)  shall be borne by the Company.
Each  holder shall bear all underwriting discounts, selling commissions, sales
concessions  and  similar  expenses  applicable to the sale of the Registrable
Securities  sold  by  such  holder.

     (b)          Registration  Procedures.  In the case of each registration,
                  ------------------------
qualification or compliance effected by the Company pursuant to Section 3, the
Company  will  keep  the holders advised as to the initiation of registration,
qualification  and  compliance  and  as  to  the  completion  thereof.  At its
expense,  the  Company  will  furnish  such  number  of Prospectuses and other
documents  incident  thereto  as  the holders from time to time may reasonably
request.

     (c)      Information.  The Company may require each seller of Registrable
              -----------
Securities  as  to  which  any  registration is being effected to furnish such
information  regarding  the distribution of such Registrable Securities as the
Company  may  from time to time reasonably request and the Company may exclude
from  such  registration  the  Registrable  Securities  of  any  seller  who
unreasonably  fails  to furnish such information after receiving such request.

     (d)          Delay or Suspension.  Notwithstanding anything herein to the
                  -------------------
contrary,  the  Company  may,  at  any  time,  delay  the  filing of the Shelf
Registration  for  a  period  of  up  to  60 days following the filing date or
suspend  the effectiveness of any Registration Statement for a period of up to
90  days  in the aggregate in any calendar year, as appropriate (a "Suspension
Period"),  by  giving  notice  to  each holder of Registrable Securities to be
included  in  the Registration Statement, if the Company shall have determined
that  the  Company  may  be  required  to  disclose  any  material  corporate
development  or other event which disclosure may have a material effect on the
Company.   Each holder of Registrable Securities agrees by acquisition of such
Registrable  Securities that, upon receipt of any notice from the Company of a
Suspension Period, such holder shall forthwith discontinue disposition of such
Registrable  Securities  covered  by such Registration Statement or Prospectus
until such holder (i) is advised in writing by the Company that the use of the
applicable  Prospectus  may  be  resumed,  (ii)  has  received  copies  of  a
supplemental  or  amended  prospectus,  if  applicable, and (iii) has received
copies  of  any  additional  or supplemental filings which are incorporated or
deemed  to be incorporated by reference in such Prospectus.  The Company shall
prepare, file and furnish to each holder of Registrable Securities immediately
upon  the  expiration  of  any  Suspension  Period, appropriate supplements or
amendments,  if  applicable,  to  the Prospectus and appropriate documents, if
applicable,  incorporated  by  reference  in  the  Registration  Statement.

6.          Indemnification
            ---------------

     (a)     Indemnification by Company.  The Company shall indemnify and hold
             --------------------------
harmless,  to  the  full  extent  permitted by law, each holder of Registrable
Securities,  its  officers,  directors,  agents and employees, each person who
controls  such  holder (within the meaning of Section 15 of the Securities Act
or  Section  20  of  the Exchange Act), and the officers, directors, agents or
employees of any such controlling person, from and against all losses, claims,
damages,  liabilities,  costs  (including,  without limitation, all reasonable
attorneys'  fees)  and  expenses  (collectively,  "Losses"), arising out of or
based  upon  any  untrue  statement  of  a  material  fact  contained  in  any
Registration  Statement,  Prospectus or preliminary prospectus, or arising out
of or based upon any omission of a material fact required to be stated therein
or  necessary  to  make  the  statements therein in light of the circumstances
under  which  they  were  made (in the case of any Prospectus) not misleading,
except  insofar as the same are based solely upon information furnished to the
Company  by  such  holder for use therein; provided, however, that the Company
                                           -----------------
shall  not  be liable in any such case to the extent that any such Loss arises
out  of  or  is  based  upon  an  untrue  statement  or  omission  made in any
preliminary  prospectus  or  Prospectus  if  (i) such holder failed to send or
deliver a copy of the Prospectus or Prospectus supplement with or prior to the
delivery  of  written  confirmation  of the sale of Registrable Securities and
(ii)  the Prospectus or Prospectus supplement would have corrected such untrue
statement  or  omission.

     (b)          Indemnification  by  Holder  of  Registrable Securities.  In
                  -------------------------------------------------------
connection  with  any  Registration Statement in which a holder of Registrable
Securities  is  participating,  such  holder  of  Registrable Securities shall
furnish  to  the  Company  in  writing  such  information  as  the Company may
reasonably  request  for  use in connection with any Registration Statement or
Prospectus.    Each  Purchaser  shall indemnify and hold harmless, to the full
extent  permitted by law, the Company, and its officers, directors, agents and
employees, each person who controls the Company (within the meaning of Section
15  of the Securities Act or Section 20 of the Exchange Act) and the officers,
directors,  agents  or  employees  of  any  such  controlling person, from and
against  all  Losses  arising  out  of or based upon any untrue statement of a
material  fact  contained  in  any  Registration  Statement,  Prospectus  or
preliminary  prospectus,  or  arising  out  of or based upon any omission of a
material  fact  required  to  be  stated  therein  or  necessary  to  make the
statements  therein  in  light of the circumstances under which they were made
(in the case of any Prospectus) not misleading, to the extent, but only to the
extent, that such untrue statement or omission is contained in any information
so  furnished  in  writing  by  such  holder  to  the  Company for use in such
Registration  Statement, Prospectus or preliminary prospectus.  Such indemnity
shall  remain in full force and effect regardless of any investigation made by
or  on  behalf  of  the  Company  or  any  holder  and any of their respective
directors,  officers,  agents,  employees  or  controlling persons (within the
meaning of Section 15 of the Securities Act or Section 20 of the Exchange Act)
and  shall  survive  the  transfer  of  such  securities  by  such  holder.

     (c)          Conduct  of  Indemnification  Proceedings.  If any action or
                  ------------------------------------------
proceeding  (including  any  governmental  investigation  or inquiry) shall be
brought  or  any  claim  shall  be  asserted  against  any  person entitled to
indemnity  hereunder  (an  "indemnified  party"), such indemnified party shall
promptly  notify  the  party  from  which  such  indemnity  is  sought  (the
"indemnifying  party") in writing, and the indemnifying party shall assume the
defense  thereof,  including the employment of counsel reasonably satisfactory
to  the indemnified party and the payment of all fees and expenses incurred in
connection  with  the  defense thereof.  All such fees and expenses (including
any  fees  and expenses incurred in connection with investigating or preparing
to  defend such action or proceeding) incurred by the indemnified party, shall
be  paid  to  the  indemnified  party,  as incurred, within 20 days of written
notice  thereof  to  the  indemnifying  party;  provided, however, that if, in
                                                -----------------
accordance  with  this  Section 6, the indemnifying party is not liable to the
indemnified  party,  such  fees and expenses shall be returned promptly to the
indemnifying party.  Any such indemnified party shall have the right to employ
separate counsel in any such action, claim or proceeding and to participate in
the  defense  thereof,  but the fees and expenses of such counsel shall be the
expense of such indemnified party unless (a) the indemnifying party has agreed
to  pay  such  fees and expenses, (b) the indemnifying party shall have failed
promptly  to  assume  the  defense  of such action, claim or proceeding and to
employ  counsel  reasonably  satisfactory to the indemnified party in any such
action,  claim  or  proceeding,  or  (c) the named parties to any such action,
claim  or  proceeding  (including  any  impleaded  parties)  include both such
indemnified party and the indemnifying party, and such indemnified party shall
have  been  advised  by  counsel  that there may be one or more legal defenses
available  to  it which are different from or additional to those available to
the  indemnifying party (in which case, if such indemnified party notifies the
indemnifying party in writing that it elects to employ separate counsel at the
expense  of  the indemnifying party, the indemnifying party shall not have the
right  to  assume the defense of such action, claim or proceeding on behalf of
such  indemnified  party,  it being understood, however, that the indemnifying
party  shall  not, in connection with any one such action, claim or proceeding
or  separate  but  substantially  similar  or  related  actions,  claims  or
proceedings  in  the  same  jurisdiction  arising  out  of  the  same  general
allegations  or  circumstances, be liable for the reasonable fees and expenses
of  more  than one separate firm of attorneys (together with appropriate local
counsel)  at  any time for all such indemnified parties, unless in the opinion
of counsel for such indemnified party a conflict of interest may exist between
such  indemnified party and any other of such indemnified parties with respect
to  such  action,  claim  or proceeding, in which event the indemnifying party
shall  be obligated to pay the fees and expenses of such additional counsel or
counsels).    No  indemnifying  party will consent to entry of any judgment or
enter  into  any  settlement  which  does not include as an unconditional term
thereof the release of such indemnified party from all liability in respect to
such  claim  or litigation without the written consent (which consent will not
be  unreasonably  withheld)  of  the  indemnified party.  No indemnified party
shall  consent  to entry of any judgment or enter into any set-tlement without
the  written  consent (which consent will not be unreasonably withheld) of the
indemnifying  party  from  which  indemnity  or  contribution  is  sought.

     (d)          Contribution.    If the indemnification provided for in this
                  ------------
Section  6 from the indemnifying party is unavailable to an in-demnified party
in  respect  of any Losses, then each applicable indemnifying party in lieu of
indemnifying  such  indemnified party hereunder shall contribute to the amount
paid  or payable by such indemnified party as a result of such Losses, in such
proportion as is appropriate to reflect the relative fault of the indemnifying
party  and  indemnified  party  in  connection with the actions, statements or
omissions  which  resulted  in  such  Losses  as  well  as  any other relevant
equitable  considerations.   The relative fault of such indemnifying party and
the indemnified party shall be determined by reference to, among other things,
whether  any  action in question, including any untrue statement of a material
fact  or omission of a material fact, has been taken or made by, or relates to
information supplied by, such indemnifying party or indemnified party, and the
parties'  relative intent, knowledge, access to information and opportunity to
correct  or  prevent  such  action, statement or omission.  The amount paid or
payable  by  a  party  as  a  result of any Losses shall be deemed to include,
subject  to the limitations set forth in Section 6(c), any legal or other fees
or  expenses  reasonably incurred by such party in connection with any action,
suit,  claim,  investigation  or  proceeding.

     The  parties  hereto  agree  that  it  would not be just and equitable if
contribution  pursuant  to  this  Section  6(d)  were  determined  by pro rata
allocation  or  by  any  other  method  of allocation which does not take into
account  the equitable considerations referred to in the immediately preceding
paragraph.    No  person  guilty  of  fraudulent misrepresentation (within the
meaning  of  Section  11(f)  of  the  Securities  Act)  shall  be  entitled to
contribution  from  any  person  who  was  not  guilty  of  such  fraudulent
misrepresentation.

7.          Rule  144
            ---------

     The  Company  shall file the reports required to be filed by it under the
Securities  Act  and the Exchange Act and the rules and regulations adopted by
the  Commission thereunder, and will take such further action as any holder of
Registrable Securities may reasonably request, all to the extent required from
time  to  time  to  enable  such holder to sell Registrable Securities without
registration  under  the Securities Act within the limitation of the exemption
provided  by  Rule  144  or  Rule  144A.    Upon  the request of any holder of
Registrable  Securities,  the  Company  shall deliver to such holder a written
statement  as  to  whether  the Company has complied with such information and
requirements.   Notwithstanding the foregoing, nothing in this Section 7 shall
be  deemed  to require the Company to register any of its securities under any
section  of  the  Exchange  Act.

8.          Underwritten  Registrations
            ---------------------------

     If  any  of  the Registrable Securities covered by any Shelf Registration
are  to  be  sold  in  an  underwritten  offering,  the  investment  banker or
investment  bankers  and manager or managers that will administer the offering
will  be  selected  by  the  Company.

     No  person  may  participate  in  any underwritten registration hereunder
unless  such person (i) agrees to sell such person's Registrable Securities on
the  basis  provided in any underwriting arrangements approved by the [persons
entitled  hereunder  to  approve  such  arrangements],  and (ii) completes and
executes  all  questionnaires,  powers  of attorney, indemnities, underwriting
agreements  and  other documents required under the terms of such underwriting
arrangements.

9.          Miscellaneous
            -------------

     (a)          Amendments  and  Waivers.  The provisions of this Agreement,
                  ------------------------
including  the  provisions  of  this sentence, may not be amended, modified or
supplemented, and waivers or consents to departures from the provisions hereof
may  not be given unless the Company obtains the written consent of holders of
at least a majority of the then outstanding Registrable Securities affected by
such  amendment, modification or supplement.  Notwithstanding the foregoing, a
waiver  or  consent  to  depart  from  the provisions hereof with respect to a
matter  which  relates  exclusively  to  the  rights of holders of Registrable
Securities  whose  securi-ties  are  being  sold  pursuant  to  a Registration
Statement  and  which  does  not  directly  or indirectly affect the rights of
holders of Registrable Securities whose securities are not being sold pursuant
to  such  Registration  Statement may be given by holders of a majority of the
Registrable  Securities  being  sold  by  such  holders.

     (b)        Notices.  All notices and other communications provided for or
                -------
permitted  hereunder  shall  be  made  in writing by hand-delivery, registered
first-class mail, next day air courier, telex, or telecopy: (i) if to a holder
of Registrable Securities, at the most current address given by such holder to
the  Company  in  accordance  with  the provisions of this Section 9(b), which
address initially is, with respect to each Purchaser, the address set forth on
Schedule  I  to  the  Purchase  Agreement;  and (ii) if to the Company, at 900
Veterans  Boulevard,  Suite  240,  Redwood  City  California 94063, attention:
Secretary,  and  thereafter at such other address, notice of which is given in
accordance  with  the  provisions of this Section 9(b), with a copy to Coudert
Brothers,  1114  Avenue  of the Americas, New York, New York 10036, attention:
John  F.  Watkins.

     All  such  notices  and  communications shall be deemed to have been duly
given:  when  delivered  by  hand,  if personally delivered; two business days
after  being  deposited  in the mail, postage prepaid, if mailed; one business
day  after being sent by next day air courier; when answered back, if telexed;
and  when  receipt  acknowledged,  if  telecopied.

     (c)          Transfer  of Registration Rights.  The rights granted to the
                  --------------------------------
holders pursuant to this Agreement to cause the Company to register securities
may  not  be  assigned  or  otherwise  transferred  in  any  way.

     (d)        Counterparts.  This Agreement may be executed in any number of
                ------------
counterparts  by  the  parties hereto, each of which when so executed shall be
deemed  to be an original and all of which taken together shall constitute one
and  the  same  agreement.

     (e)      Headings.  The headings in this Agreement are for convenience of
              --------
reference  only  and  shall  not limit or otherwise affect the meaning hereof.

     (f)     Governing Law.  This Agreement shall be governed by and construed
             --------------
in  accordance  with  the  laws  of  the  State  of New York without regard to
principles  of  conflict  of  laws.

     (g)     Severability.  If any term, provision, covenant or restriction of
             ------------
this  Agreement  is  held  by a court of competent jurisdiction to be invalid,
void  or  unenforceable, the remainder of the terms, provisions, covenants and
restrictions  set forth herein shall remain in full force and effect and shall
in  no  way be affected, impaired or invalidated, and the parties hereto shall
use  their best efforts to find and employ an alternative means to achieve the
same  or  substantially  the  same  result  as that contemplated by such term,
provision,  covenant  or restriction.  It is hereby stipulated and declared to
be  the  intention  of the parties that they would have executed the remaining
terms,  provisions,  covenants  and restrictions without including any of such
which  may  be  hereafter  declared  invalid,  void  or  unenforceable.

     (h)       Entire Agreement.  This Agreement is intended by the parties to
               ----------------
be  a  final  expression  of  their  agreement  and  a  complete and exclusive
statement  of the agreement and understanding of the parties hereto in respect
of  the subject matter contained herein.  There are no restrictions, promises,
warranties  nor undertakings, other than those set forth or referred to herein
with respect to the registration rights granted by the Company with respect to
the  securities  sold  pursuant  to  the  Purchase  Agreement.  This Agreement
supersedes  all  prior  agreements and understandings between the parties with
respect  to  such  subject  matter.

     (i)          Attorneys'  Fees.  If any action or proceeding is brought to
                  -----------------
enforce  any  provision  of  this  Agreement, or where any provision hereof is
validly  asserted  as  a  defense,  the  successful party shall be entitled to
recover  reasonable  attorneys' fees in addition to its costs and expenses and
any  other  available  remedy.



     IN  WITNESS  WHEREOF,  the  parties  have  executed  this agreement as of
October  21,  1997.

                         PENN  OCTANE  CORPORATION



                         By:  /s/  Jerome  B.  Richter
                              ------------------------
                              Jerome  B.  Richter
                              Chairman,  President and Chief Executive Officer




IN WITNESS WHEREOF, the parties have executed this agreement as of October 21,
1997.



                              CASTLE  ENERGY  CORPORATION


                              By: /s/ Joseph L. Castle
                                 ------------------------
                              Name: Joseph L. Castle
                              Title: Chairman and CEO




     IN  WITNESS  WHEREOF,  the  parties  have  executed  this agreement as of
October  21,  1997.





                                /s/ Clint Norton
                          --------------------------------------
                                   Clint  Norton



                         SOUTHWEST  CONCEPT  INC.


                         By:  /s/ Clint Norton
                                 ------------------------
                              Name: Clint  Norton
                              Title: President




     IN  WITNESS  WHEREOF,  the  parties  have  executed  this agreement as of
October  21,  1997.




                                /s/ James  F.  Meara, Jr.
                          --------------------------------------
                                   James  F.  Meara,  Jr.




                         SEP  FBO  JAMES  F.  MEARA  IRA

                         By:          Donaldson,  Lufkin  &  Jenrette  as
                                   Securities  Corporation  Custodian


                         By:  /s/ James  F.  Meara
                                 ------------------------
                              Name: James  F.  Meara
                              Title:



     IN  WITNESS  WHEREOF,  the  parties  have  executed  this agreement as of
October  21,  1997.



                    LINCOLN  TRUST  COMPANY  FBO  PERRY  D.  SNAVELY  IRA



                         By:  /s/ Perry D. Snavely
                                 ------------------------
                              Name: Perry D. Snavely
                              Title: