RE: IML: How about Synthetic oils? (Ken Lang's question)

["Dick Benjamin" <dickb@xxxxxxxxx>]

I think that's right - as to the year for the first catalytic converter.
However, unless you care enough about air quality to insist on keeping your
cat in full operation even for the few miles you drive each year, or unless
you live in CA where we HAVE to keep our cats going forever, I'd think you
could switch to the older formulation oils without worry.  When your car was
new, the then current oil rating was "SE", which should agree with your
owner's manual - that had around 0.130% ZDDP, if I recall correctly, so your
cat is probably already not up to snuff.

Dick Benjamin

-----Original Message-----
From: mailing-list-owner@xxxxxxxxxxxxxxxx
[mailto:mailing-list-owner@xxxxxxxxxxxxxxxx] On Behalf Of aeyn
Sent: Wednesday, September 06, 2006 8:07 AM
To: mailing-list@xxxxxxxxxxxxxxxx
Subject: Re: IML: How about Synthetic oils? (Ken Lang's question)

Dick,
    So this means with my car 1975, the ZDDP is not a good thing,
as it has a catalytic converter in it.  My understanding is that
the 1975's were the first year to get the converter.

Æyn

--- Dick Benjamin <dickb@xxxxxxxxx> wrote:

> I'll try to answer this - if it goes through, maybe things are
> working
> again.
> 
> Yes, unless the synthetic oil is recommended for use in
> Diesels, I doubt
> very much that it contains enough ZDDP for use in car which is
> seldom
> driven.  The reason for that is that in order to qualify for an
> SL or SM
> rating (look on your oil container), the Zinc Anti-wear
> additive has been
> eliminate to avoid poisoning the catalytic converter in modern
> cars.  In
> other words, if it is sold for use in modern cars, it isn't the
> right stuff
> for a collector car that is parked for weeks at a time.  When
> Mobil One
> first came out, this wasn't so serious a problem, but the SL
> and SM rated
> oils have really dropped the amount of ZDDP to just about zero
> - the SK
> article gives precise numbers, which I don't have at the tips
> of my fingers
> at the moment.
> 
> Dick Benjamin
> 
> -----Original Message-----
> From: mailing-list-owner@xxxxxxxxxxxxxxxx
> [mailto:mailing-list-owner@xxxxxxxxxxxxxxxx] On Behalf Of Ken
> Lang
> Sent: Tuesday, September 05, 2006 3:44 PM
> To: mailing-list@xxxxxxxxxxxxxxxx
> Subject: RE: IML: New Info on engine Oils - was lifter info -
> From Dick B.
> 
> I'm wondering if this applies to synthetic oils as well.  I've
> been using
> Mobil One in my 67.
> 
> 
> 
> 
> 
> 
> 
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