CERTIFICATION
                             Pursuant to Section 906
                        of the Sarbanes-Oxley Act of 2002

         The undersigned, the Chief Financial Officer of Old Mutual Absolute
Return Master Fund, L.L.C. (the "Fund"), with respect to the Fund's Form N-CSR
for the period ended March 31, 2008 as filed with the Securities and Exchange
Commission (the "Commission"), hereby certifies, pursuant to 18 U.S.C. Section
1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002,
that, to the best of my knowledge:

         1. such Form N-CSR fully complies with the requirements of section
13(a) or 15(d) of the Securities Exchange Act of 1934; and

         2. the information contained in such Form N-CSR fairly presents, in all
material respects, the financial condition and results of operations of the
Fund.

Dated: June 5, 2008

                                          /s/ Ross Weissman
                                          -----------------
                                          Ross Weissman
                                          Treasurer & Chief Financial Officer



A signed original of this written statement required by Section 906 has been
provided to the Fund and will be retained by the Fund and furnished to the
Commission or its staff upon request.