[T3] ZDDP options

[Jim Adney]

On 15 Jan 2014 at 13:03, Dennis Stiefel wrote:

> Jim I have heard that about with Diesel oil and catalytic converters
> too. What I don't understand is a lot of diesels have had cats on them
> for years.  When I worked on school buses we had some as old as 97s
> with cats on them.  They had a Ford B-700 chassis with a 5.9 Cummins
> engine.  The cat was built in the mufflers and we had to replace one of
> them and it was a $2300 muffler. That's how I remember that.  So how
> is the additives in the diesel oils like Rotella and Delo not harming
> these set ups in the later model  Diesel?  Guess it is not important as
> far as our cars are concerned.  Maybe the cats are different in these
> than the gas. Also they have been putting cats on cars here in the US
> since 1975 and it took them that long to figure out this stuff damages
> the cat? 

Those are all good points, and I don't have the answers. I'm gonna 
guess that there have been changes in the cats as well as the oil 
over the years. Another thing that may have changed is lean burn 
engines. If you use less fuel, and run a little hotter, that may 
change the kinds of compounds that make it into the cat.

Rotella and Delo may have switched to additives that work somewhat 
the same as ZDDP, but don't have the same effect on the cats.

-- 
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Jim Adney, jadney at vwtype3.org
Madison, Wisconsin, USA
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