I will start looking for EP ratings on motor oil, thanks.

Racing go carts and motorcycles probably see very high temps. My temprature checks have been done with my infared gun and I will admit that I haven't had any hot weather yet to really run fair tests. Most areas are below 200*F but I have seen the cylinder head temp as high as 236*. But the only place that needs oil is the top of the piston down and those temps seem lower. Of course there really isn't a way to check the temp of the piston itself. The only info I have is quite a bit of run time on my LA .40 with used Dello 400 at 18% - time will tell. On a two stroke the oil only gets hot onece so there is no time for the oil to degrade over time like a truck engine. Every stoke gets fresh oil.

Treven.