[Shop-talk] Fw: [mg-tabc] More on ZDDP

[David Scheidt]

On Tue, Nov 10, 2009 at 3:34 PM, Karl Vacek <kvacek at ameritech.net> wrote:

> Chris, I really don't know - I'm passing on info from another list,
> unedited and unchecked.  The last set apparently came from the website
> linked at the beginning of the message.  I fully agree with you that it's a
> moving target, and I personally wouldn't take any info like this as either
> gospel or current, whether it's from the manufacturers or from lab tests of
> product purchased at retail.  It's just an indication of what was typical
> for those specific oils at some time, perhaps recently or perhaps not.
>
> What I did find interesting, however, was the historical info about when
> the standards changed and the PPM limits that were imposed at various
> points. We've been using too little zinc in our old-car oils for years and
> only in the past couple of years has it become widely discussed.


And, in the opinion of a friend of mine (a professional tribologist, does
work on lubrication failure), you're better off not worrying about it too
much.


-- 
David Scheidt
dmscheidt at gmail.com