Recent content by Vulusmaximus

To answer your questions: 1) I'm not. 2) I'm not. 3) It needs to be a minimum of 30. Quoting from the web on this topic; 'The number 30 is often used as a rule of thumb for a minimum sample size in statistics because it is the point at which the central limit theorem begins to apply. The...

No, I haven't done so thus far.

Here' the all wear chart I have :) These are the corresponding oils: 1) Shell Rotella T6 2) Shell Rotella T6 3 )Millers CFS NT+ 4) Millers CFS NT+ 5) Liquid Moly 6) Ravenol RUP 7) Millers 8) Pentrite Enviro+ 9) Pentrite Enviro+ 10) Liqui Moly 11) Castrol Edge M 12) Castrol Edge M 13) Fuchs...

Pulls the pin, throws the subject out there and quickly steps back... Gentlemen, I've been collecting BMW N57 used oil analysis... I've have now collected 36 oil samples results on 27 engines. Excluding five because: a) the oil is not known, b) it's a run in oil, or c) there is a known...

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...

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 :)

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...

We put the car in for a full service with a VAG specialist who was recommended to us. It never occurred to me that they would have a used the wrong oil. I'm only now finding this out ! :mad:. Another garage has just done this oil change and looking at the reciept they used VW504 5w30.

I would have preferred it if it had been a blit lower as extrapolating to 10,000 miles it works out at 53 (against a preferred benchmark of lower than 50). That said it's way way lower than both the Audi and BMWs we have as well ! LOL

Thank for your thoughts :) The car has just done over 60,000 miles, it's not tuned, but it is driven quite hard, although only after the engine oil is up to temperature. The 7,553 miles is how long the sampled oil was in the engine.

Hi guys Just had the oil sampled on my son's 2018 VW Golf-R Mk7.5. The oil that was in was Quantum 0w20 which supposedly has a Visc 40C rating of 39.9. I don't quite understand why the Visc 40C rating has gone up. The sodium is high, not sure why, the car is running fine and not losing any...

Some figures can't be extrapolated, but some can. For instance without extrapolating you have no idea if a ppm figure is good or bad. The problems come when extrapolating from a small mileage, that's obviously open to be skewed especially with this engine when not all the oil can be drained at...

Here's the raw data data from the last 4 tests and the same data set extrapolated to 10,000 miles. Interesting to see that the ppm rate for the Iron and Ali and Sodium is much improved with the MOTUL 5w/40 oil, although currently still too high. I'm going to resample again when the car gets to...

Hi guys, a relative noob to oil analysis question for the hive mind. I've had several used oil analysis conducted (BMW N57 diesel engine) and I've seen a number that people have uploaded as well. The used oil analysis comment on the oil chemistry against a Visc 40C - cSt metric. I've been...

Yes, I think I'm going to go with Motul next time.