How long should it take for engine oil to go black in a M-jet?
I have asked loads of people and they give me a different answers.
only had it serviced about 2months ago and mines black.

Ive changed the oil and filter on mine once myself. The oil was black again a few weeks later. Think thats how diesels are, was quite weird was always used to see'ing nice clean oil for ages in previous petrol car

often within a few minutes!