Thanks for that, Randall, and others. An interesting counterpoint that was
not in the article I read, for obvious reasons ;-). I got an answer from
Castrol tech support which suggests the issue *may* be the use of GF-4 oils,
lists 8 types of Castrol (including GTX) with "more zinc than the SG oils
marketed during the muscle car era", and 6 types equal to the SG level.
I'm not plugging Castrol, it's just who I asked first. I would be happy to
forward the email to anyone who wants the details.
I had been trying to find a comparison / timeline on the different
historical
API grades. Anyone know of one? Thanks
Jeff
Randall wrote:
> Including an explanation of how the cam/lifter problems started _before_
> they
> reduced the ZDDP levels in motor oil ?
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