Re: Motor oil for older engines

[ortfamily@xxxxxxx]

Gas and diesel engines often share the same oil. Check the oil bottle where the certifications are. There will be an S and a C rating, something along the line of SH CE or whatever. The S is for a spark ignited engine (gas) and the C is for a combustion fired engine (diesel). Over the years oil has become more highly refined and improved, with the ratings going up. Most AMC engines were probably built in the SC or SD era; today I think oils have progressed to SJ. Wonder what they will do when they go past SZ.

On November 6, 2004 Jay Ciampi wrote:

> I was reading a "tech Tip" in a Nash Club regional newsletter the other day
> stating that we, who own cars with pre-cat.converter engines, should use
> Diesel motor oil as it still contains ZINC for lubricating cam lobes,
> valves,etc.
> Modern engine with Cats don't need  Zinc as they use hardened parts and Zinc
> will totally ruin a Cat.  Modern gasoline engine motor oils do NOT contain
> any Zinc for that reason.
> 
> Anyone out there that confirms that we need Zinc or  can refute the
> statement that Zinc isn't  necessary?  I have never looked at a bottle/can
> of diesel motor oil to what it contains, so I have no idea if this is a
> genuine concern for older engines or not.  if your engine has been
> overhauled with modern components, Zinc would not be necessary for your
> engine lubrication.
> 
> Jay in FL.
> 
> 
> 
> 
> 
> .


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