I usually use motorcycle-specific oil in my 4-stroke quads, but I have a quantity of 15w-50 Mobil 1 oil I like to use up. Do any of you use Mobil 1 oil, and what is your experience with it? I am concerned with possible clutch slippage. I figure it will be OK, but want to know from you guys first. Does it seem to perform well? Please advise me. Thanks!

 

I personally don't know of any difference between them, but I always use the Yamaha oil. This link is for break-ins but if you scroll about 3/4 down, it talks about the synthetic oil. I'm sure yours is always broken in, but it's a good link and hope it helps.Synthetic Oils

 

I'm not sure how it is with ATV's, but I know on my sportsbike, they recommend that you DO NOT use Synthetic. Since the oil is used with the tranny, it will cause slippage.

Tim