As some of you know I recently bought a Dodge Caliber SRT-4. I swapped out the factory fill at 860 miles for fresh fill of M1 0w40 and I'm starting to think about my next oil change. Dodge calls for M1 0w40 or a synthetic 5w40 if M1 0w40 is not available. I will eventually go with a stage 1 upgrade and a new downpipe to add approx 50 horsepower. I am contemplating changing over to Red Line, but it you guys think Mobil 1 0w40 will protect just as well why spend the extra cash? What do you guys think?