Quote:
Originally Posted by Arne2
The warning about catalyst damage is the reason most modern oils have lost their zinc. Zinc is said to be hard on cats. That warning is probably present on all high-ZDDP oils.
Personally, I suspect the fears of cat-damage are overblown. We've had cats on cars here in the USA since '75, and ZDDP didn't start going away in oil until the last - what, maybe 10-15 years?
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+1, if it bothers you and you want to preserve your engine, get a by-pass and install the cat for smog tests or you can always service the cat by washing it out. smog check will fail the cat if it is below 95% efficiency.