According to Castrol, Syntec 20W-50:
"Exceeds all car and light truck manufacturer's warranty requirements for the
protection of gasoline, diesel and turbocharged engines where API SM, SL, SJ,
SH, CF or CD is recommended."
This implies--but doesn't state unequivocally, natch--that Syntec 20W-50 is
SM-rated, and AFAIK this means reduced Zn and P (i.e. ZDDP).
Anybody who has a bottle want to check the label? Just wondering if Castrol is
trying to "have it both ways," or is there a "special" Syntec 20W-50 for older
cars?
bs
--
***************************************************************
Bob Spidell San Jose, CA bspidell@comcast.net
'67 Austin-Healey 3000 '56 Austin-Healey 100M
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-------------- Original message ----------------------
From: Editorgary@aol.com
> In a message dated 1/18/08 9:00:24 AM, healeys-request@autox.team.net writes:
>
>
> > Sounds like it's "regular" SYNTEC which, since it's also used with
> > modern cars, would have to have reduced ZDDP in order to preserve cat
> > converters.
> >
>
> Don't get me wrong here.. I am not promoting or endorsing Castrol (don't use
> it myself -- I get a special oil through my mechanic Butch Gilbert).
> BUT just to keep the facts straight, what I would point out for those of you
> who don't want to go to the trouble and expense of ordering Amsoil or another
> special oil (not that there's anything wrong with that)...
> the website shows 20W50 Syntec oil in the marketing promotion that was quoted
> on the MG list and 20W50 is NOT used in modern cars AFAIK. They all require a
> much lower weight synthetic oil. Hence it is quite plausible that an oil
> company might be putting different amounts of ZDDP in their different weights
>of
> the same brand of oil.
> Just the facts, ma'am.
> Cheers
> gary
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