BMW N57 Oil Sample Charts

[Vulusmaximus]

Gentlemen
I have been collecting N57 oil sample data and thought I would share the results thus far. 30 samples on 24 engines. I am currently restricting the chart to only showing a max of two samples per engine. The legend against each sample shows the example number, miles on the engine, oil rating and a unique sample serial number.
Kind regards to all
Ian

The oils sampled were:
1) Shell Rotella T6
2) Shell Rotella T6
3 )Millers CFS NT+
4) Millers CFS NT+
5) Liquid Moly6) Ravenol RUP
7) Millers
8) Pentrite Enviro+
9) Pentrite Enviro+
10) Liqui Moly
11) Castrol Edge M
12) Castrol Edge M
13) Fuchs Titan GT1 Flex 23
14) Titan Supersyn Long Life.
15) Pentrite
16) Castrol Edge
17) Acea C3
18) Quantum
19) Castrol Edge
20) M1 ESP
21) Motul 8100 X-Clean Gen2
22) Motul 8100 X-Clean Gen2
23) n/k
24) Tripple Qx Synplus PD
25) Millers EE Performance C3
26) Castrol Edge Professional
27) Quantum
28) Quantum Long Life III
29) n/k
30) BMW

 

[fantastic]

Very interesting to see it on a graph.

 

[BMWTurboDzl]

Have you adjusted for engines which were tuned?

You should categorize based on HTHS.

 

[Vulusmaximus]

I haven't, adjusted for those that are tuned, it wasn't something I was recording up to now, but I shall change that going forward. The only one I know is tuned is SO44 which has a Stage 1 map on it.

I'll investigate adding HTHS data as well where I can.

Thanks for your suggestions

 

[BMWTurboDzl]

I haven't, adjusted for those that are tuned, it wasn't something I was recording up to now, but I shall change that going forward. The only one I know is tuned is SO44 which has a Stage 1 map on it.

I'll investigate adding HTHS data as well where I can.

Thanks for your suggestions

Ya basically C3 vs C2 since I know BMW promoted such for the N57

 

[dnewton3]

Combined metal rates are not something I put any faith in; too easy for problems trends to be obscured by other data.

I caution anyone against taking this as anything but entertainment; no conclusions can be accurately drawn about any one brand/grade of lube from this macro-data set. The Stdev is huge and so "normal" is very broad.

What is the basis for the 10% adjustment from previous samples? I assume you're trying to account for residual, but what make you think 10% is the right value for compensation? versus 5% or 20%?

Why report the combined PPM per 1k miles, but the individual metals per 10k miles; that's kind of odd ...

 

[Vulusmaximus]

I absolutely agree about not drawing any conclusions over brand/grade, the data set is too small, interesting nonetheless... The combined rate is useful I think as an overview, but I agree completely agree with the point you make.

The 10% adjustment is based on the fact that approx 0.5 of a litre isn't drained during the oil change. At my last change after only doing 50 miles I had the oil sampled again to determine what was still kicking around the system. That's where the figure has come from. I intend to do the same again at the next change (sample at the change and then sample again 50 miles into the new oil) to hopefully corroborate the 10% figure.

The different reporting is because I had seen some articles that took the total wear and reported it as ppm me 1k miles. I may change it in the future, we shall see