When you look at the viscoscity numbers on the bottle (eg. 10W30), the 10 refers to cold start. the 30 refers to running engine temperature viscoscity. .
Up here in Canuckistan:toothy8: we use a 0-30w in the dead of winter because it flows at -35.
If you're concerned about the high temperatures use a higher viscoscity oil, not lower. Try a 10-40w
