2002 Yamaha YFM660 Grizzly factory service and repair manual, Page 127Get this manual
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CHANGING THE DIFFERENTIAL GEAR OIL
6.Fill: Differential gear case Periodic oil change: 0.28 (0.25 Imp qt, 0.30 US qt) Total amount: 0.33 (0.29 Imp qt, 0.35 US qt) Recommended oil: SAE 80 API "GL