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

I, Douglas Lindgren, 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:    March 5, 2008        /s/ Douglas Lindgren
         -------------        --------------------------------------------------
                              Douglas Lindgren, 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:    March 5, 2008        /s/ Robert Aufenanger
         -------------        --------------------------------------------------
                              Robert Aufenanger, Principal Financial Officer