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

I, Craig Goos,  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:     3/6/09                         /s/ Craig Goos
     ----------------------              ---------------------------------------
                                         Craig Goos, Principal Executive Officer


I, Robert  Aufenanger,  Principal  Financial  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:     3/6/09                          /s/ Robert Aufenanger
     ----------------------               --------------------------------------
                                          Robert Aufenanger, Principal Financial
                                          Officer