2002 Bombardier Quest 650XT Service Manual, Page 380Get this manual
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Section 11 TECHNICAL DATA Subsection 02 (QUEST 500)
338 kg (745 lb)
Differential oil
21.8 (5.8 U.Sgal) (1.1 U.Sgal) (3.17 quarts) SAE 10W40, 4-stroke mineral based oil