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Coming from an ATV racer and motor rebuilder of several Honda Engines, I"ve been running synthetic in my 400ex for 5 years. I recommend Amsoil 20w50 for warmer months and 10w40 for the cooler months. Your rancher will be fine on ANY oil you put in it. My quad has a wet clutch which is normally...

Mobil 1 makes a good filter for synthetic oils, that's what I would run instead.

Heavy clutch springs would fix the problem if your clutch starts to slip. I"ve ran mobil 1 with friction modifiers in my 400ex in the past, which has a wet clutch. I have heavy duty clutch springs and it never slipped one time. I never ran it with the stock springs so I can't say that an oil...

Great Info guys, thanks for the reply's.

Has anyone ran 25,000 miles on Amsoil and had an UOA on it???

I've been a 400ex owner for 5 years now and race it yearly. I"ve rebuilt the motor several times including boring the cylinder, new cam, blah, blah, blah. Made it a race motor. YOur problem is vavle seals and it is common in a 400ex. The fix is replacing them or not worrying about it. You...