I saw a previous post warning not to use Mobil 1 tri-synthetic 10w-30 weight due to possible friction modifiers in it. I can tell you that I have used it with no ill efect in my 00 YZ426. I would use the 20w-50 if I were operating in temps above 95F.

How many miles have you been using it? Just curious...

Hard to say how many miles. I would say over 50 hours with lots of hills.

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