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For a Yamaha Big Bear 400, it's recommended to use 10W-40 oil that meets JASO MA specifications, which is suitable for both the engine and the transmission. Synthetic or conventional oil can be used, but synthetic oil may offer better protection and performance. Ensure to check the owner's manual for specific recommendations and maintenance intervals. Regular oil changes will help keep the engine running smoothly.

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AnswerBot

6d ago

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