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                                                                   EXHIBIT 4.2


                             SUPPLEMENTAL INDENTURE


              Supplemental Indenture, dated as of November 7, 1995 (the
"Supplemental Indenture"), among Union Texas Petroleum Holdings, Inc., a
Delaware corporation (the "Company"), the Guarantors party hereto (collectively
the "Original Guarantors"), and The First National Bank of Chicago, a national
banking association, as trustee (the "Trustee").

              The Company, the Original Guarantors and the Trustee are parties
to that certain Indenture dated as of March 15, 1995 (the "Indenture").  All
capitalized terms used in this Supplemental Indenture and not otherwise defined
shall have the meanings as defined in the Indenture.

              Section 406 of the Indenture provides that in the event any
Guarantor (including the Original Guarantors) shall no longer be a guarantor of
any Funded Indebtedness of the Company other than the Guaranteed Securities,
and so long as no default or Event of  Default shall have occurred or be
continuing, such Guarantor, upon giving notice to the Trustee to the foregoing
effect, shall be deemed to be released from all of its obligations under the
Indenture and the Guarantee of such Guarantor shall be of no further force or
effect.

              The Indenture further provides that following the receipt by the
Trustee of any such notice, the Company shall cause the Indenture to be amended
pursuant to the terms of Section 1001 of the Indenture to reflect the release
of each Guarantor specified in such notice from its Guarantee.

              By letter dated November 7, 1995, the Company and the Original
Guarantors gave notice to the Trustee that no Original Guarantor guaranteed any
Funded Indebtedness of the Company other than the Securities and that no
Default or Event of Default has occurred or is continuing.

              NOW THEREFORE, for good and valuable consideration, the receipt
and sufficiency of which are hereby acknowledged, the parties to this
Supplemental Indenture hereby agree as follows:

              1.     Effective November 7, 1995, and notwithstanding anything
contained in the Indenture to the contrary, each Original Guarantor is hereby
released from such Original Guarantor's obligations under the Indenture and
such Original Guarantor's Guarantee is hereby terminated and is of no further
force or effect.

              2.     The Indenture is in all respects acknowledged, ratified
and confirmed by the Company and shall continue in full force and effect with
respect to the Company in accordance with the terms thereof, as supplemented by
this Supplemental Indenture.  The Indenture and this Supplemental Indenture
shall be read, taken and construed as one and the same instrument.





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              3.     Simultaneously with and as a condition to the execution of
this Supplemental Indenture, (a) the Company is delivering to the Trustee (i) a
resolution of the Board of Directors of the Company authorizing the execution
of this Supplemental Indenture, and (ii) an opinion of counsel of  the Company
in the form attached hereto as Exhibit A, and (b) each Original Guarantor is
delivering to the Trustee a resolution of the Board of Directors of such
Original Guarantor authorizing the execution of this Supplemental Indenture by
such Original Guarantor.

              4.     This Supplemental Indenture shall be governed by and
constructed in accordance with laws of the State of New York, without regard to
principles of conflicts of law.

              5.     The parties may sign any number of copies of this
Supplemental Indenture.  Each signed copy shall be an original, but all of them
together represent the same agreement.

              IN WITNESS WHEREOF, the parties hereto have caused this
Supplemental Indenture to be duly executed and delivered as of the day and year
first above written.


                           COMPANY:                               
                           -------                                
                           Union Texas Petroleum Holdings, Inc.   
                                                                  
                                                                  
                           By:      /s/ M. N. MARKOWITZ      
                                    ------------------------------
                                    M.N. Markowitz                
                                    Vice President and Treasurer  
                                                                  
                           TRUSTEE:                               
                           -------                                
                           The First National Bank of Chicago,    
                              as Trustee                          
                                                                  
                                                                  
                           By:        /s/  T. MARSHALL       
                                      -----------------------------
                           Name:      T. Marshall                            
                                      ----------------------------
                           Title:     Trust Officer                             
                                      -----------------------------
                                                                  
                           GUARANTORS:                            
                           ----------                             
                           Union Texas East Kalimantan Limited    
                                                                  
                                                                  
                           By:        /s/ M. N. MARKOWITZ    
                                      -----------------------------
                                      M.N. Markowitz              
                                      Vice President and Treasurer






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                           Union Texas Petroleum Energy Corporation
                                                                   
                                                                   
                           By:        /s/ M. N. MARKOWITZ
                                      -----------------------------
                                      M.N. Markowitz               
                                      Vice President and Treasurer 
                                                                   
                                                                   
                           Union Texas International Corporation   
                                                                   
                                                                   
                           By:        /s/ M. N. MARKOWITZ
                                      -----------------------------
                                      M.N. Markowitz               
                                      Vice President and Treasurer 
                                                                   
                                                                   
                           Union Texas Products Corporation        
                                                                   
                                                                   
                           By:        /s/ M. N. MARKOWITZ
                                      -----------------------------
                                      M.N. Markowitz               
                                      Vice President and Treasurer 
                                                                   
                                                                   
                           Unistar, Inc.                           
                                                                   
                           By:        /s/ M. N. MARKOWITZ 
                                      -----------------------------
                                      M.N. Markowitz               
                                      Vice President and Treasurer 
                                                                   
                                                                   
                                                                   
                                                                   


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The form of opinion contained in Exhibit A to the Supplemental Indenture is
omitted herein, but will be provided upon request.