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2022 MXZ XRS 600R
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In my opinion, just about any oil will work in the chain case. A friend who raced ovals for years used old motor oil in the chain case of his race sled.
 

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Put some in the freezer and see what it looks like after 24 hours. I would probably run it... I bought an off-brand quart of full synthetic last month and it was $17 USD from O'Riley's. Seems like last time I could get a quart of full-synthetic Valvoline for half that much. I don't think an old chain case needs $17 oil.
 
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