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Re: Motor Oil Question [LBC content]

To: "Jacques Le Clainche" <hobbycars@cox.net>
Subject: Re: Motor Oil Question [LBC content]
From: "Glen Byrns" <grbyrns@ucdavis.edu>
Date: Mon, 2 Apr 2007 12:46:14 -0700
Since I read about the accelerated destruction of flat-tappet cams when used 
with the new low-ZDDP oils, it solidified my habit of only using Castrol 
HD30wt.  I'd always avoided the multi-weights because of the know tendency 
for the additives to add to 'coking' problems on hot turbo bearings.  From 
what I've read, once the cam is broken in with old fashioned ZDDP rich oils, 
it is less of a risk to switch over to the modern oils.  But I'm just 
paranoid and won't change.

> I read that a non-API oil is usually so because it contains too much of 
> the
> additive ZDDP (Zinc Dialkyl Dithiophosphates) to be certified. I 
> understand
> the API limits the amount of ZDDP additive allowed in the oil because it
> shortens the life of the catalytic converter. Now, most if not all of our
> LBCs don't have catalytic converters, and the added Zinc in non-API oils 
> is
> supposed to reduce wear on the engine. So, I wonder if any lister is
> presently using a non-API oil, synthetic or not, and what they think?
> Any oil expert on this list?

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