So long as you change it often, you probably won't see any power difference. Just make sure you use the right viscosity. I change my oil just before every event (about once a month) and the oil filter every other month. Helps keep me honest. Besides, I honestly run my car too hard.
Scrammer is right though, Royal Purple is probably the best out there.
Lisa Belgetti: When people risk their lives, shouldn't it be for something very important?
Michael Delaney: Well, it better be.
Lisa Belgetti: But what is so important about driving faster than anyone else?
Michael Delaney: Lotta people go through life doing things badly. Racing's important to men who do it well. When you're racing, it's life. Anything that happens before or after is just waiting.
- Le Mans (1971)