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58 Posts
Zinc and phosphorus will eventually destroy the platinum and palladium in catalytic converters, so it's a good idea to take it out of oil in modern engines. Not so with flat tappets--here's an explanation I just found:
http://blog.sfrcorp.com/2007/10/15/zddp-in-additives/
Bob
http://blog.sfrcorp.com/2007/10/15/zddp-in-additives/
Bob