2004 Skidoo ZX Series Service Manual, Page 246Get this manual

2004 Skidoo ZX Series Service Manual, Page 246

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Section 05 ENGINES (4-TEC) Subsection 05 (LUBRICATION SYSTEM)
OIL LEVEL CHECK
Snowmobile must be on level surfaceWarm up the engine to 80C (176F)Leave engine running at idle for at least 3