Dave,
You're right, we may have to just sort this out to our own satisfaction.
I've always used Castrol GTX
and would like to rationalize that I can continue to use it. I may not be
able to make that leap. Thanks.
Vrooom vrooom,
John
----- Original Message -----
From: "Dave & M" <rusd@sitestar.net>
To: "John Soderling" <jsoderling@astound.net>
Cc: "Healey List" <healeys@autox.team.net>
Sent: Sunday, May 13, 2007 4:58 PM
Subject: Re: Confused - ZDDP and our oils
> Hi John,
>
> I'm as confused as anyone.
>
> The listed results are quite old, considering that oil content &
> published numbers are changing very rapidly.
>
> the published numbers that you quote which are quite high, certainly
> enough to do the job. It's my belief that any oil that actually meets
> API service SM for 2007 will of necessity have it's ZDDP content
> significantly reduced from this level.
>
> If I'm wrong, it has only cost me a few bottles of EOS. If right, a
> new cam & lifters have been saved. I doubt if we will ever get a
> straight answer from the oil companies. They MUST cater to the
> majority of customers. The folks with flat tappet cams who might be
> affected by the newest oils are an insignificant percentage of their
> whole customer base. I believe the manufacturers started using roller
> tappet cams which don't require the high ZDDP levels in the mid
> 1980's. Not many older cars are on the road.
>
> I note that the small specialty sellers of oil for race & off road use
> are not hesitant to publish right up front what the ZDDP content of
> their oils are.
>
> I think each of us will have to make a decision & hope for the best.
>
> Regards,
> Dave Russell
>
>
>
> John Soderling wrote:
> > Help, I'm also confused now regarding Castrol GTX. The website
> > http://www.lnengineering.com/oil.html lists test results on a
> > number of engine oils including Castrol GTX 20W50. The test was
> > conducted 11/05 and The GTX is listed as Type DINO and API SM. Yet
> > the ZDDP seamed good unless I don't understand them - P(ppm)=1157 &
> > ZN(ppm)=1422. These are at a level of .1157% & .1422%
> > respectively. Since the tested GTX is listed as API SM, can I
> > assume that the tested GTX is the most current oil some are saying
> > does not have sufficient ZDDP levels? Thanks. Confused. Vrooom
> > vrooom, John Erika the Red
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