Michael, diesel engines are exempt from most all state emmission
inspections, and which large H.D. trucks or cars (diesel) have a cat.
converter.
----- Original Message -----
From: Michael D. Porter <mporter@zianet.com>
To: Philip E. Barnes <peb3@cornell.edu>
Cc: <triumphs@autox.team.net>
Sent: Wednesday, October 13, 1999 2:24 PM
Subject: Re: oil note
>
> "Philip E. Barnes" wrote:
>
>
> > use. The response was to use a "heavy-duty" oil intended for diesels.
The
> > reasoning was these oils have more additives for anti-oxidation and
> > anti-corrosion than passenger car oils. The additives apparently have a
> > detrimental effect on catalytic converters, so have been reduced or
> > eliminated in "modern" oils. Made sense to me. Perhaps I'll go down to
the
> > local Kenworth dealer for my next oil change.
>
> Curious... since every heavy-duty on-road diesel engine today is
> equipped with a catalytic converter to meet emissions standards. I
> suspect that oil formulations for diesel engines have changed, as well.
> For what it's worth, we put Mobil Delvac 1200 in all engines, regardless
> of make, except for natural gas engines which require a lower ash
> content. Delvac 1200 is a 100% synthetic 15W-40, I believe. And we
> recommend oil changes every 6K miles....
>
> If you are looking for diesel engine oil with a pre-catalyst additive
> package, look for an oil which only meets CC or CD specs. Those are
> diesel standards which go back to the early `80s. They may simply not be
> available, though.
>
> Newest spec oils (up to CH-4 according to the Lubrizol site I use
> frequently) probably resemble an additive package more like current
> light automotive oils, so if you don't specify an older spec oil at that
> Kenworth dealer, you may get a fancy, quite expensive version of
> something you can buy at Pep Boys.
>
> Have look at this site. It will probably explain a _great deal_ more
> than the lubrication expert in Car & Driver:
>
>
http://www.lubrizol.com/referencelibrary/readyreference/6-OilClasses/Cclass.
htm
>
> It's fairly apparent from that page that classes CA through CE are now
> obsolete. CF through CH-4 are likely oils suitable for use with
> catalytic converters, since the ratings for each are referenced back to
> properties of now-obsolete classes.
>
> I highly recommend the Lubrizol site to everyone--there's a wealth of
> information there, freely available, on anything and everything having
> to do with lubrication.
>
> Cheers, Phil.
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