After spending a couple of hours researching the ZDDP issue online and
seeing things like this...
"I've seen more bad cams in the last year than in my previous 30 years as a
cam grinder." From a Hot Rod magazine article.
Today I called Valvoline's corp HQ in Kentucky and spoke to one of their
techies. He told me VR-1 is specifically intended to be a flat-tappet oil
similar to the older ones now off the market and that it is intended to be
changed at regular 3000 mile intervals. He said they called it 'Racing' to
make it perfectly clear in the marketplace that it is not for modern
engines. He said they had had zero complaints and was pleased but not
surprised to hear about M. Salter's 10 miles at racing speeds with no oil.
He also said don't use their other racing grades as they're intended to be
changed after every race--they don't have the longevity ingredients of
street oil.
Quaker State and someone else also have similar Racing Oils but they may not
have quite as much ZDDP in them.
Some experts also advocate using Diesel Oils, but some grades are not
applicable and some are phasing out ZDDP due to use of cat convs in diesels
coming up.
Most info seemed to say adding an additive such as ZDDPlus creates iffy
mixtures. Also with STP Red one might have to mix too much in there to get
the ZDDP level--too much polymers. Perhaps the polymers were what caused my
14 mpg--before I'd typically get 16-17mpg.
--
Steve Gerow
Pasadena CA
59 BN6
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