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#586492 - 07/25/03 07:05 AM Any opinions??
Mike Piles Offline

Registered: 07/24/03
Posts: 1
Loc: Arnold, MO
Done by OilGuard
Oil: Caterpillar 5W40 SDEO
Miles on oil 10166
Miles on Car 91766

Aluminum 4
Chromium 4
Copper 8
Iron 23
Lead 0
Tin 1
Silicon 9
Potassium 0
Sodium 0
Water <0.1
Oxidation 64.4
Visc@100 17.0
Glycol None Detected
TBN 3.4
Soot 0.8


All engine wear rated appear normal. High degree of oxidation Indicated. Suspect high operating temperature and/or over extended drain interval.

Any opinions would be appreciated.

Mike Piles

00 Green VW Jetta 5 speed TDI

#586493 - 07/25/03 09:18 AM Re: Any opinions??
TooSlick Offline

Registered: 08/02/02
Posts: 5785
Loc: Dixie

I think you need to thoroughly clean your EGR valve. I believe what is happening here is the valve is stuck open with oil/soot deposits. This is allowing lots of exhaust loaded with oxides of sulphur and nitrogen into the combustion chamber and generating very high levels of nitration/oxidation. Both these processes result in the formation of organic acids, which is depleting the TBN. In addition, oxidation essentially increases the molecular weight of the oil and is causing the thickening you see.

The wear rates look pretty good, but running with very high rates of oxidation will result in the gradual formation of sludge/varnish/carbon deposits. So this isn't something you want to let continue. It is very uncommon to see Delvac 1 degrade like this in the TDI ...!