Recent Topics
36 Pack Batteries AA and AAA $5.97
by Hybrid
2 minutes 24 seconds ago
A good backpack.
by daves87rs
14 minutes 24 seconds ago
$.99 LED Light Bulbs
by redbone3
28 minutes 39 seconds ago
Is pink trans oil still "good"?
by supton
29 minutes 51 seconds ago
Remington Golden Saber Ammo - $10 MIR/box
by LoneRanger
48 minutes 4 seconds ago
Mystik JT-8 HDEO 5gal-$24.99 at mills 11/28
by volk06
57 minutes 2 seconds ago
Ram must be a sponsor - Macy's T-day parade.
by mrsilv04
Today at 10:41 AM
Opinions please
by Jake777
Today at 09:51 AM
[Cut Open] Toyota 90915-YZZF2 - 2657 miles
by DuckRyder
Today at 09:41 AM
OSRAM Night Breaker Unlimited.
by JustinH
Today at 09:40 AM
F-150 5.0, Mobil 1 5W-20, 7k miles
by Tones
Today at 08:54 AM
RK conventional $1.29 qt today only
by fdcg27
Today at 08:35 AM
Newest Members
robertoc, Monti, JackWang, SophiaBorree, DavidVerba
56134 Registered Users
Who's Online
84 registered (05LGTLtd, 2015_PSD, akela, andyd, 4wheeldog, aquariuscsm, 3 invisible), 1237 Guests and 136 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
56134 Members
66 Forums
241106 Topics
3905803 Posts

Max Online: 2862 @ 07/07/14 03:10 PM
Donate to BITOG
Topic Options
#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 ...!