Need Help with Oil Analysis Results
 

This is not on my MB, but in the VW Jetta TDI. Thanks upfront.

Mobil Delvac 1 5w40
No make up oil
6200 miles on oil and filter
Miles on unit 197,424
Stock spin-on filter

Glycol NEG
Water <0.05%
Fuel <1.0%
Viscosity @100c 17.4
Soot 1.8
Oxd % 8.9
Nox % 14.3
TBN 12.1

Iron 16
Chromium 0
Lead 0
Copper 0
Tin 0
Aluminum 4
Nickel 0
Silver 0
Manganese 1
Silicon 4
Boron 36
Sodium 0
Magnesium 44
Calcium 1988
Barium 0
Phosphorus 971
Zinc 1086
Mo 0
Ti 0
V 0
Cd 0

Oil is suitable for reuse
Change full flow filter, if not done when sampled
Top off system
Resample at next regular interval

Lance:

Somehow your oil has thickened considerably.

The virgin Delvac 1 5W-40 should have a viscosity around 15.0 cSt at 100 deg C.

Wonder why? I did replace the headgasket, turbo, injectors, and water pump over the past 10k miles. Right after the headgasket change, I ran some Delvac 1300 15w40 through for about 1000 miles as a flush to get rid of any coolant traces...do you suppose some of that thickened up the Delvac 1?

I changed the oil and filter after 1000 miles replacing the Delvac 1300 with Delvac 1, but I suppose there could have been enough residual left????

I can't say for sure but 1.8% soot will cause the oil to thicken some. The higher viscosity doesn't seem out of line or alarming to me.