Quote:
Originally Posted by blackax
They do make full synthetic break in oil. Also watch out because high zinc oils will kill your cats very quickly.
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I think that is a major reason they got away from it as a common additive. I'm only going to run it for the first few oil changes, less than 2,000 miles, and unless it gets a bunch of oil in the combustion for some reason (which it really shouldn't) not much if any zinc should make it to the cats.