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Message: [QUOTE="DanS, post: 94719, member: 20849"] The only thing I can think of is that heavier weight oil is better at higher temps. Maybe they expect the crankcase temp of the EXC's to run hotter than the MXC/SX because of the type of riding normally done on each. I don't see where that would be the case but it's one idea. It could have something to do with the higher gearing. They may feel that faster spininning gears need heavier oil for one reason or another. [/QUOTE]