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2007 Honda 400ex...what kind of oil?

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Changing this for the first time.  Manual says GN-4 10w 30.  Should I stick with that or use a synthetic and if so, what kind?

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I would use a good quality commercial grade engine oil like Rotella T.

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Changing this for the first time.  Manual says GN-4 10w 30.  Should I stick with that or use a synthetic and if so, what kind?

I used a size thicker then 10w40 because the 400ex were know to burn oil a lil faster

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