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[EMD]

I've had the same blackness when changing deesal oil ... maybe this means contaminants
are still in the system and an engine flush would maybe
clear this 

[JasonH]

I had exactly the same issue with a first service on diesel Honda Accord, that was at 14k miles.

I checked the oil a day or two later and it was black. Queried it with the garage and they assured me it had been changed. With hindsight I think they probably did change it.

Having run a couple of diesels for a few years now unless you halve the oil change intervals (which I do) you cannot see an improvement in the oil colour after a change. Even at half the intervals the oil is pretty much grey after one journey.

There's enough black oil left in the system that it colours the new oil immediately.

In terms of invalidating the warranty, when I've made warranty claims they look at the service book. So the additional services I've carried out (using genuine parts but not recorded in their book) aren't an issue. And I doubt they'd have a leg to stand on even if they were aware.

[omega2018]

if its black shortly after changing say 2 engine hours then either it has not been changed or all the old oil was not removed.  most likely the latter.  if you go to the trouble of removing all oil from a diesel it will stay amber for a while.  difficult though - on my diesel the oil cooler retains a lot of oil.   alternatively flush by doing two changes.  when i have done either of those the oil has stayed nice and clear for quite a few hours running at least.

common to change the oil and not bother with the filter especially when a car is being sold hence always give a new car an oil change.