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You're comparing two different products - Mobil Delvac 1 Gear Oil 75W-90 and Mobil Delvac 1 Gear Oil LS 75W-90.

It's difficult to compare them as they are tested using different in-house methods; different engines, different conditions and different test limits.

Another issue could be the masking of wear of yellow metal components in UOA. There would also be a potential conflict with the electronics industry regarding cost and availability of the copper. There may also be differences in toxicity and other such factors between copper and zinc...

Mostly in San Francisco or Los Angeles by the looks of it. https://afdc.energy.gov/fuels/hydrogen_locations.html#/find/nearest?fuel=HY

Here's what Mercedes have to say about it... The principal recommendation is for MB 229.5.

Castrol Transmax Manual V 75W-80 works, if you can find it. https://msdspds.castrol.com/bpglis/FusionPDS.nsf/Files/0924D55E21283EC780258A750034832F/$File/wepp-cy25zt.pdf

This summer my son was gifted a young driver experience - this is an opportunity for youths to have a go at driving a car in a controlled environment (in this case an airfield). He is 13 years old and was booked to drive a compact automatic hatchback (a Vauxhall/Opel Astra). However on the day...

Well, it says not to compare between specs - I'd argue that comparison within the same publishing body is within scope. Besides, I simply proposed an answer to the question "Where is your data that VW502.00 leaves more sludge etc?". I was using Lubrizol's publicly-available tool as a proxy...

True enough, and any oil can significantly exceed the demands of the spec meaning a very good 502 00-approved oil may perform better than a marginal 508 00 one, but the comparison remains that the requirements to achieve 508 00 approval are more strict than for 502 00.

Maybe here?

You sometimes see the same in the dipstick tube if it is particularly long.

Another factor - steel wheels are more malleable when cold, so if you accidentally side-swipe a curb or hit a hidden pothole they will tend to bend and buckle, whereas an alloy wheel can crack. A bent wheel may still hold pressure and get you home but a cracked wheel won't.

Well I don't know since it's not stated why!

BP was never "Beyond Petroleum"; this was just a slogan that was used when they reinvented their brand early in this millennium but the company name was never "Beyond Petroleum". It used to be "British Petroleum" but now it is officially just "BP".

Because Austria has a much better global history...!

Agreed. You can look up the required specification on MB's BeVo website here: https://operatingfluids.mercedes-benz.com/sheet/231.1 Here's the important bit...

There was a round at the Portland International Raceway this year, yes.

A diesel engine oil will usually get thicker in use, due to soot loading and oxidation. The low KV40 is a worrying result and suggests to me serious fuel dilution, which would then lead to reduced oil film thickness in critical areas like crank and big end bearings. Without knowing what the oil...

If you look at the International PDS the Porsche spec is there (this is a newer PDS too): https://msdspds.castrol.com/bpglis/FusionPDS.nsf/Files/357CF750A0C8950F802589FD004CD093/$File/wepp-cua8kf.pdf

Perhaps have a think about why the ODIs are set the way they are. Distance-based is fairly obvious but time-based...? Well there is some truth that an oil can continue to degrade over time, especially one that is contaminated with acids and other oxidation products. But the timescale over which...