Oil and Maintenance Guide for 2003 Yamaha Big Bear 400 4x4 400
Before You Service the Engine
Before servicing the 2003 Yamaha Big Bear 400 4x4 400, confirm the lubricant requirements and prepare to verify the final fluid level. Use the proper level-check method for this machine, and verify product suitability instead of relying on a catalog name alone.
How much oil does a 2003 Yamaha Big Bear 400 4x4 400 take?
The available engine-oil capacity figure is 3.7 quarts. The amount added during a routine drain may differ from the listed capacity; use the correct level-check procedure when refilling.
What does 10W-40 mean on an engine-oil label?
The number before W describes the oil’s cold-temperature viscosity classification, while the second number describes its viscosity at operating temperature. The grade does not, by itself, establish whether the oil meets all the requirements for an ATV engine.
