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CBreaken

Oil weight temp range

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I was looking through the yamaha service manual for my 04 yz450f and found that yamaha specifies an oil weight range for USA and Canada,(20w-40 for temps above 40 and 10w-30 for temos below) and then a second oil weight range for the rest of the world,(tons of weights across a broad temp range with 10w-40 being the most versitile) whats up with that? Is this another EPA mandated deal?

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It is an EPA deal. Has to do with wear reducers formerly found in SG oils, which are no longer in the current SJ/SL spec. Use a 10w-40 oil with a JASO grade MA. It's the equivalent of an SG with improvements. See my elaborate response on this subject in the recent thread "what kind of oil do you use?"

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A side note; the Golden Spectro petrolium/synthetic blend is still classified SF/SG and is also listed as JASCO MA. I'm sure there are other oils that still fit this catagory.

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