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best oil to run for cooler temps

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10W-40 is the recommended weight especially for cooler weather. Use a JASO MA 10W-40 on both sides of the CRF250.

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I use gn4 10w40 on both sides in temps ranging from about 50-100+. Don't ride in any other temps really.

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whats wrong with 20w 50 for colder tempes 55-40

As long as it is a synthetic it should be fine.

The oil passages in the 250 are not very large some of them are less than .080" , thick oil will not flood these areas very well when cold.

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