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Thanks for the quick response. Couple of more things to add. I have read many articles warning against using synthetic oil on rebuilt engines.(At least initially). Mine is a complete rebuild..with all new moving parts except the bronze idler. The articles argue that synthetic oil do not really...

Hello all, I am very close to completing a rebuild on an old Cadillac flathead engine. Specifically, a 1948 346 ci motor. I have been warned that this engine (because of the bronze idler gear) must have an oil that has a high concentration of ZDDP. I chose Valvoline VR1 Racing oil 10W30. It...