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I have a 2002 Chevy Impala LS with the 3.8L V6 and I have 40,000 miles on the car now. I've been using AMSOIL Series 2000 0W-30 since the car had 3,500 miles on it. I'm wondering if the Series 2000 0W-30 is the best oil for my car... Should I maybe go with the Synthetic 5W-30 (ASL) or the...