Alot of people like Brad Penn & Valvoline Racing oil due to their high zinc content. I use the VR oil.

3) Motor oils that are too thick rob horsepower and affect performance. Try to go as thin as safely possible. For example, a friend of mine races his car in the 10.90 second bracket. He uses a high quality 10W-30 motor oil and has outstanding wear numbers from his Used Oil Analysis (UOA) report. Try to never assume that a high performance engine must have a 40-or-50 grade motor oil to survive.

Racing engines are different than street engines. The guys want to get every fraction of horsepower for that 1/8 or 1/4 mile run. I would never run 10W-30 motor oil on a high performance street car in the HOT summer temps especially on long drives. (thermal breakdown)