King - show me your empirical evidence. Here's mine:

http://www.yft.org/tex_vfr/tech/oil.htm
http://www.xs11.com/stories/mcnoil94.htm
http://www.ibmwr.org/otech/oilreport.html

 

UBETRUN, I agree with you! I have ben using Mobil 1 in my two-strokes and four-strokes for about fives years now and never had any problems.

I use 10W-40!!! [img]i/expressions/face-icon-small-smile.gif[/img]

 

Click Link For Best Oil Available

 

Ubetrun- I do think syth. is the way to go. But i am slow to make changes. I run syth in my Buick Grand National

 

cheap guys rebuild there engines more often. run synthetic, it will more than pay for itself in the long run. Amsoil is darn good oil, i ran mobile 1 fully synthetic on my last big bore quad, never had a problem.

 

I change the oil so often in my raptor that it will not have a short engine life from what oil i run. I will probably strip the oil plug before my engine is worn out.

 

I had clutch slippage on Yama lubes semi syn, on a stock bike.

The guys using Mobile 1, is this like the same Mobile 1 from Auto Zone? or is it a atv specific oil?

 

Yes.

 

Gentlemen, I have tried all except Amsoil in my mild Raptor....Maxima Extra is the only oil too use IMO. READ: BIG BORE RAPTOR OWNERS.....when I run 15-50 MAXIMA EXTRA in my application, I can run hard....step off the bike and lay my hand on the cylinder head....with no clutch slip. I have posted on this oil before.