Thanks for the input. I haven't even cosidered Redline. I use it religiously on my shifter kart but I think I will give mobil one a try. I can't seem to find 20/50 on the mobil one web site which only list these weights...

0W-30
0W-40
5W-30
10W-30
15W-50

Where did you find the 20/50 bad24?

thanks for the advice.