Originally Posted By: 04SE
Originally Posted By: jstutz
Not really relevant to your post, but I always felt more comfortable with a heavy duty oil in my 400ex. I ran rotella 5w40 year round with good results. When i ran the honda 10w40, after about 30hr(very rough guess) the valves would chatter a little when really hot. With the T6 the engine sounded the same through the entire oil change. Also i believe oil temp goes up almost linearly with ambient temp in an air cooled engine so if it is 90F, you could probably add about 10 deg to your oil temps. Being you have a temp gauge, it will be interesting to see if you see the same effect with temperature.
I really want to try T6 but I know I can shear it in probably 3-4 hours. I use and abuse my ATV, I mean like it is stolen type of abuse.
I dont run mine very hard. Its still kicking fine with the 5w40 in it. If you run yours that hard, then just listen to Sunruh as he has data to back up his claims. I dont. I dont know but maybe a 15w50 would be a good fit for you since you run it so hard. I dont think the thickness is an issue, even in the winter. They warm up fairly quickly. Unless it is really cold like less than 20F or so. My grizzly definitely dont like the 15w40 in the sub 0 temps. It starts up much better with the 5w40 in it.