Exhibit 5.1

                            NACCARATO & ASSOCIATES
                      18301 Von Karman Avenue, Suite 430
                               Irvine, CA 92612
              Telephone: (949) 851-9261 Facsimile: (949) 851-9262

October 7, 2005

VIA ELECTRONIC TRANSMISSION

Securities and Exchange Commission
450 Fifth Street, N.W.
Washington, DC 20549

Re:     South Texas Oil
        Form SB-2 Registration Statement

Dear Sir or Madam:

       We have acted as counsel for South Texas Oil., a Nevada corporation (the
"Company"), in connection  with its  Registration Statement on Form SB-2/A  and
subsequent  amendments (the "Registration  Statement")  being  filed  with  the
Securities and  Exchange  Commission relating to the registration for resale of
an  aggregate  of up to up to  7,170,775  shares  of  common  stock  underlying
convertible notes  in  a  principal  amount  of  $2,300,000 and up to 1,959,228
shares  of common stock issuable upon the exercise  of  common  stock  purchase
warrants  at  $.574  a  share.   The convertible notes are convertible into the
number of common shares that would equal forty-five percent (45%) of the equity
of the fully diluted shares  of  South  Texas Oil Company.  At the time of this
registration, on a fully diluted basis, this would approximate 3,918,456 shares
at $.587 per share.  In conjunction with  the  convertible notes, warrants were
issued to the note holders that convert into 1,959,228  common  shares  with an
exercise price of $.574 per share.

        In connection with the foregoing, we have examined, among other things,
the Registration Statement and originals or copies, satisfactory to us, of  all
such  corporate  records  and  of  all  such other agreements, certificates and
documents (including instruments evidencing  or  setting  forth  the  terms and
provisions  of  the  Convertible  Securities)  as  we  have deemed relevant and
necessary  as  a  basis  for  the  opinion  hereinafter  expressed.   In   such
examination,   we   have   assumed  the  genuineness  of  all  signatures,  the
authenticity of all documents  submitted  to us as originals and the conformity
with the original documents of documents submitted  to  us as copies. As to any
facts material to such opinion, we have, to the extent that relevant facts were
not independently established by us, relied on certificates of public officials
and  certificates, oaths and declarations of officers or other  representatives
of the Company.

        Based on our examination  mentioned above, we are of the  opinion  that
the  securities  being sold pursuant  to the  Registration  Statement are  duly
authorized and will be, when sold in the manner described in  the  Registration
Statement, legally and validly issued, and fully paid and non-assessable.

        We  hereby  consent to the filing of this opinion as Exhibit 5.1 to the
Registration Statement  and  to the reference to our firm under "Legal Matters"
in the related Prospectus.  In  giving  the foregoing consent, we do not hereby
admit that we are in the category of persons  whose  consent  is required under
Section  7  of  the  Act,  or  the rules and regulations of the Securities  and
Exchange Commission.

        Very truly yours,

        /s/ Owen Naccarato, Esq.
                  Naccarato & Associates