Quote Originally Posted by l3vnd1 View Post
So thinner oil is better for power and response, However a thicker oil protects better at higher temperatures.

Hmmmm....

Can you Mix 5 - 30 with 10 - 40 and make a hypothetical 7.5w - 35w? (like octane)

Correct about response and I guess power. All depends on additivies and stuff and the properties of the oil. It's hard to say what oil protects better. But as a rule, I say thicker at higher temps to protect... so yeah if I were you, i'd use 10W-40 in summer for track work.

NFI about mixing... why bother?