I had an earlier than necessary oil change as I think the first oil change should be done way sooner than usual 18000 kms. I checked the oil (using the dipstick) after driving about 175 kms to see if the oil was clean (hoping the dealer didn't screw me over). The oil does not look new. It is sort of blackish. Now I know the diesel oil gets contaminated with soot pretty soon after an oil change but this soon? Also, I know that I should have checked it the same day but it was too cold to do so!