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lucas synthetic

  1. 20W-50: Pros and Cons

    Under what circumstances would it be acceptable to run 20W-50 oil in a 4.7L? Reason: I just bought 24 qts of Lucas Synthetic 20W-50 for $1/qt. It was on a clearance "sidewalk sale" table at Pep Boys (along with a bunch of other odds and ends.) I drive in hot climates. Engine has 250k miles on...