Delvac 1 LE in BMW X5 35d

[m37charlie]

The results were somewhat disappointing.
First, VOA on D1 LE:
Al 2
Si 5
Na 5
Mg 762
Ca 1980
P 773
Zn 929
Mo 44
B 113
vis 12.0
TAN 3.54
TBN 9.6 (D4739)

Next D1 LE Castrol SLX Prof LE
12600mi 9000mi 10000mi
Fe 152 83 94
Cr 6 4 5
Pb 3 1 3
Cu 18 12 20
Al 26 27 33

Si 6 4 6
Na 3 5 7
K 20 31 51

Mg 674 11 10
Ca 2160 1960 2509
P 876 768 910
Zn 1020 859 815
Mo 45 1 B 80
vis 11.7 10.0 11.6
soot 0.8% 0.9% 0.6%
TAN 8.07 ??? 4.83
TBN 2.3 1.5 1.5
All not listed either 0, 1 or negative.
During the middle of the D1 LE the EGR cooler failed and was replaced, evidently no coolant leak (except the K results??).

Conclusion: I ran the D1 LE too long. If I run it the prescribed 10K mi TBN/TAN will be better. Possibly the relatively high VOA TAN relates to esters Mobil tech line confirms are in the D1. Possibly the high Fe number relates to ester "washout" from the first OCI on D1.
This is obviously a high Fe/Al excreting engine. I haven't gone on the BMW forums to confirm that however.
This next OCI I will change when the indicator tells me to and not delay 2600 miles.

Charlie

 

[JHZR2]

Wow, that's some Fe!

 

[DNVDMAX]

Charlie,

Is the Bimmer garage kept during the winter? If not, do you plug in below say 10*F above zero? Thanks for posting, very interesting.

 

[m37charlie]

It's in the garage.
I think the main problem with the engine is EGR - the nitric acid ingestion from combustion byproducts I suspect is quite high.
I'm very glad I removed it on the U500, particularly since I've done 22K OCIs.

Charlie

 

[dnewton3]

I would agree that the last Castrol OCI went a bit too long, however I don't see any real evidence of harm done overall. I also concur with the EGR comments.

Interesting how there is no hope of prediction between TAN to TBN relationship. (I don't expect it to be linear, but these examples show no correlation whatsoever).

Just keep the OCI a bit shorter; 10k miles is proably reasonable.

 

[m37charlie]

Originally Posted By: dnewton3
I would agree that the last Castrol OCI went a bit too long, however I don't see any real evidence of harm done overall. I also concur with the EGR comments.

Interesting how there is no hope of prediction between TAN to TBN relationship. (I don't expect it to be linear, but these examples show no correlation whatsoever).

Just keep the OCI a bit shorter; 10k miles is proably reasonable.


The first 2 OCIs (10K and 9K) on the right side were Castrol SLX Professional OE "weak" LL04 oil.
The last one, on the left, 12.6K, was D1 LE. Interesting that the D2896 TBN is 12.6 but D4739 only 9.6.

Charlie

 

[Ile_D4D]

I have been waiting for your first analysis with D1 LE. Hopefully there`s nothing basically wrong with the oil.

I have owned Toyota Avensis D-4D since new. Now after 11 years it has 455 tkm (283 Kmls) in the odometer.

First 200 tkm used M1 0W-40 (OCI 15 tkm, 9,3K). Then began following this forum and became convinced about D1 5W-40 and ran with it to 400 tkm (OCI 20 tkm, 12,4K). The last two years have been running with D1 5W-30 LE (OCI 20 tkm, 12,4K) in the hope of lower friction and still hoping it is as wear resistant as original D1.

Newer done UOA. Maybe I should, but UOA´s with cars are allmost unknown in Finland. At least Mobil Finland has that service.

 

[m37charlie]

I think the oil is fine. The problem is that probably about 40% of the intake "air" on this engine is exhaust!

Charlie