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Hello all, I drive a 1946 Plymouth Deluxe, and absolutely love it. But admittedly, I've always pined for the Chrysler New Yorker of the same year. I intend to own one in addition eventually, so I read up on any information I can get about them. Having procured an original owners manual, I noticed something unexpected. The book calls for SAE 20 oil to be used in the crankcase on the eight cylinder models at normal temperature. My Plymouth calls for SAE 30. So, why the difference? They're pretty comparable engines, or so I understand. Further, do any of you Chrysler owners use SAE 20? Many thanks in advance, and all the best, J.P.G.
