[Vwdiesel] RE:Gunked up case, good parts- Clean case,

[James Hansen]

> 	I believe that detergents are in engine oils still.  The problem
> 	in the old days is that there would be a crudded up engine, and
> 	someone put in a detergent oil, and voila, there were chunks of
> 	crud floating around.  Usually something like a lifter would
> 	suffer a stroke.  Sometimes it was some oil passage.  Bad news.
>
>

Yes. Any oil for passenger car use has detergents of varying levels in it.
Non-detergent was available until mid 70's I believe, then it just dropped
off the map for automotive applications.   There were very specific levels
of detergent oils as well- XD-3 esso oils were very high detergent, suitable
for heavy trucks etc.  We used this in Dad's Mack for years, when the pan
came off to check the bearings, it was white shirt and tie clean in
there.(was on a 300hp twin turbo V-8 Mack engine in 1984)  I do know that
use of a lesser rated oil then switching to a high detergent oil such as the
XD-3 would raise some problems on the first change, such as excess usage
until the rings had a chance to get "reseated" over the removed deposits, or
so it was explained to me.

I can't hardly find straight mineral oil now unless you buy a straight grade
oil intended for hydraulic system applications.  Thing is, most new stuff
uses the transmission or rear end for the hydraulic reservoir, so the oil
intended for that purpose is a 30 weight combination gear oil-transmission-
hydraulic system oil.  It keeps stuff clean too, so I would suspect there is
some inherent detergent level in there as well. I do know of one guy that
put hytran (a brand of hydraulic-transmision oil sold by Case-IH) into his
passenger truck (350 chevy)   it did not survive well. Sounded like it had
an extra 350,000 miles on it after. Big oops.
-James
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