CERTIFICATION PURSUANT TO RULE 30A-2(B) UNDER THE 1940 ACT AND SECTION 906 OF
                         THE SARBANES-OXLEY ACT OF 2002

I, Richard Sipes,  Principal  Executive  Officer of UBS Multi-Strat Fund, L.L.C.
(the "Registrant"), certify that:

          1.   The Form N-CSR of the Registrant  (the  "Report")  fully complies
               with the requirements of Section 13(a) or 15(d) of the Securities
               Exchange Act of 1934, as amended; and

          2.   The information  contained in the Report fairly presents,  in all
               material  respects,   the  financial  condition  and  results  of
               operations of the Registrant.


Date:    February 28, 2005          /s/ Richard Sipes
     ----------------------        --------------------------------------------
                                    Richard Sipes, Principal Executive Officer

I, Michael Mascis,  Principal Accounting Officer of UBS Multi-Strat Fund, L.L.C.
(the "Registrant"), certify that:

          1.   The Form N-CSR of the Registrant  (the  "Report")  fully complies
               with the requirements of Section 13(a) or 15(d) of the Securities
               Exchange Act of 1934, as amended; and

          2.   The information  contained in the Report fairly presents,  in all
               material  respects,   the  financial  condition  and  results  of
               operations of the Registrant.


Date:    February 28, 2005          /s/ Michael Mascis
     ----------------------        --------------------------------------------
                                    Michael Mascis, Principal Accounting Officer
                                    (principal financial officer)


THIS  CERTIFICATE IS FURNISHED  PURSUANT TO THE  REQUIREMENTS  OF FORM N-CSR AND
SHALL NOT BE  DEEMED  "FILED"  FOR  PURPOSES  OF  SECTION  18 OF THE  SECURITIES
EXCHANGE ACT OF 1934, OR OTHERWISE SUBJECT TO THE LIABILITY OF THAT SECTION, AND
SHALL NOT BE DEEMED TO BE  INCORPORATED  BY REFERENCE  INTO ANY FILING UNDER THE
SECURITIES ACT OF 1933 OR THE SECURITIES EXCHANGE ACT OF 1934.