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cojo

yamalube 4r 10w-50

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i picked up a couple quarts of this because the dealer said that it was a good oil. now im sure all oils are good, being they are used what they are meant for, but this oil isnt in the manual. so basically i want to know if this is a safe oil to use on my 04 yz450f?

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its not a bad oil in my manual the oil you use is recomanded at certain temps and 10 50 is just as good as 10 40 unless you ride in colder weather

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That's what I use in my 426 :cry: Do a search on oil and you will find more information than you ever wanted :cry:

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I've been using that stuff in my bike since it was new and have had no problems with it. The thing I don't get is the manual. On the US part it specifies 20w-50 or so, and on the international spec. it calls for 10w-40 across the board. What gives? Are US oils different?

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