> It is my understanding that ZDDP contains a heavy metal that is heavily
> controlled by the EPA, in the U.S., and that has a lot to do with why it's
gotten so scarce in engine oils lately.
ZDDP was removed because it can shorten the life of catalytic converters,
the same reason we have unleaded gas.
http://en.wikipedia.org/wiki/Zinc_dithiophosphate
As long as you don't drive a new Cadillac, it's affect on the cat shouldn't
be a problem. They go through converters about once a year, compared to
>300,000 miles for a typical Honda converter.
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