what about adding an additive?
From: "Dick Benjamin" <dickb@xxxxxxxxx>I'll try to answer this - if it goes through, maybe things are workingagain. Yes, unless the synthetic oil is recommended for use in Diesels, I doubt very much that it contains enough ZDDP for use in car which is seldom driven. The reason for that is that in order to qualify for an SL or SM rating (look on your oil container), the Zinc Anti-wear additive has been eliminate to avoid poisoning the catalytic converter in modern cars. In other words, if it is sold for use in modern cars, it isn't the right stuff for a collector car that is parked for weeks at a time. When Mobil One first came out, this wasn't so serious a problem, but the SL and SM rated oils have really dropped the amount of ZDDP to just about zero - the SK article gives precise numbers, which I don't have at the tips of my fingers at the moment. Dick Benjamin
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