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Originally Posted By: JustinH The original poster didn't mention anything about the motor or the blower. Is this a stock 03+ cobra with the roots supercharged 4v motor? If so then you don't need something like rotella 5w40. What did you do to it to get 500 horsepower? If you have the tune...

Originally Posted By: AdRock Go with something thicker than the 5w-20. Go up to a 5w-30. My suggestions would be Amsoil or Redline. Do you post on dfwstangs? yep im on most of the mustang boards. is a M1 5w30 ok?

1. Ford Mustang Cobra DOHC supercharged ~500hp 2. Ford recommends a 5w20 3. I live in North Texas 4. I drive the car hard and fast usually on the street and occasionally at the track 5. This car is usually driven on SHORT trips/weekend cruises 6. No known problems with the car Thanks!