On another note, here is some stuff I found about diesel oil servicing.
https://www.maroochydore.kenmillsto...e-black-why-this-happens-after-a-service/554/
Now I get it can discolour but for new oil to look that black after 50ks or so is tuff to swallow.
The article does say
The high soot production, part of the everyday running of the car, takes care of the rest and within a few days that lovely new oil can look rather dirty.
But it isn't discriptive enough about how dirty it will actually look after just 50kms. More importantly the article doesn't elaborate on the reasons new oil gets so dirty so quickly.
I doubt it's caused just by new soot production from combustion after just 50kms. I suspect it's that old sooty diesel oil behaving like a dye and any that remains within the engine galeries and bearings, etc, will stains the new oil. Having said that, I don't remember my old turbo diesel being so black so quickly after an oil change
May be it's just a memory thing being that was 20 years or so ago but don't think so
It could be due to the fact some engines hold more old oil within, after being drained, simply due to their design. It also seems that some old oil can build up on the engines internals (not unlike pertol engine oil sludge) and that this oil can be held against the metal bits in a glue like way... Interestingly, back in the old days when i had an old diesel, some would swear that if you put (one brand of) flush in the new oil and flushed after 1/2 hour, you'd get more fluid out than was put in (considerably more in some cases).
May be the following videos highlight some aspects of this dirty oil after an oil change and the later one an oil flush process.
Me, i'd still have trust issues with a stealership bacause i've been burnt before. Having such black oil just 50km after an oil change in a new modern diesel that should produce much less soot than old 80's clattering diesels would thus have me pondering whether the oil was changed hjust as you are
