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Everyone has a different opinion on this topic. Any help would be greatly appreciated. I just can't decide which oil to use. Are their any oil types that I should not use for sure? Anyone using Castrol 4T 10W40. It's meets all the standards listed in the owner's manual for both API and JASO. I have an 07 Ultra Lx and an 08 250X
 

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amsoil is great, so is Mobile 1. I'm turbo charged so i use mobile 1 15w50
 
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