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Just put the 5w in the motor, full tranny flush to Amsoil. Tranny shifts better in the cold, tranny temp gauge is lower, engine runs cooler and better. MPG is up to top it off! Thanks for helping me out with all the questions.

I just bought some Amsoil from here and put it in my 2002 Buick LeSabre with over 120,000 miles. It runs great and my MPG went up 2 MPG on the hwy, amazing stuff. I used the engine cleaner first since I never used synthetics before, cleaned the crankcase all out, runs awesome