Q. You have written about the diesel-type noise found in gasoline engines called piston slap but I don’t recall you writing about the cause. Also, would a certain type of oil help this condition? D.S.
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Piston Slap: Classic Oil for a Classic Packard
I have a 1941 Packard 120 sedan, and Castrol GTX 20w50 was recommended. Is this correct? Thanks! Sajeev answers: Provided you were recommended Castrol GTX’s classic formulation, this is a good choice.
Q: I have a 2003 Pontiac Vibe with 135,000 miles on it. This past winter it would knock for a minute or so on a cold start. A GM tech told me that it has a cold piston slap and it will go for a long ...
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