I use kendall gt1 20w50 summer and winter...never had a lubrication "blow up" in all kinds of weather, racing or not.

 

Kendall is another good choice.

 

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I have seen a motorcycle engine stuffed into an atv frame too. It's called the 400EX. It is an XR400 motor stuffed into an atv frame.

A lot of atvs have detuned motorcycle engines in them.

Most atv manufacturers will tell you not to use automobile specific oil in an atv. Supposedly, the car oil has friction modifiers, and energy conserving additives that will, or could, do the wet clutch motor more harm than good.

You really can't go wrong using any Honda, Yamaha, or Suzuki motorcycle oil. I use the Mobil 1 red cap 15W-50 in all of my atvs. It is the only Mobil 1 oil that doesn't have any of the above mentioned BS in it.

 

Every time I blow something up, its only because of major component faliure! lol rods, crank. But everytime my motors come apart, the bearings/cam all had a good coat of oil on them. [img]i/expressions/face-icon-small-smile.gif[/img]

 

I saw a Honda CBR 650 engine on a 400 EX frame. It was on ebay and supposedly it did 140MPH in 3rd gear with a top speed of 170. Mobil oil is good.