2004 Bombardier Quest/Traxter Series Shop Manual, Page 504Get this manual
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Section 12 TECHNICAL DATA Subsection 03 (QUEST 650QUEST 650 XT)
Differential oil
21.8 (5.8 U.Sgal) (1.1 U.Sgal) (3.17 quarts) SAE 10W40, 4-stroke mineral based oil SG, SH or SJ or B