hello all, I have a question about the merits of oil viscosity choices for a high performance engine. With new engines being built much tighter than before I wonder if lighter weight oils wouldn't serve better than thicker? On another forum I see hobby racers using 40 or 50 weight and saying its for bearing protection. Would't a thinner oil fit in the tight spaces better? I would also think a thinner oil would cool quicker, (and heat quicker) which in a long work session would be helpful.