Why are the pistons so dirty?
Is it because of poor petrol quality?
Question to the 320si mechanic above.
Yesterday I gave my car to friend to drive it...and while on 5th, reving he accidentally went to put 4th instead of 6th, but he didn't do it fast...but decluched really slow...so it revved up to 7.500 and just before it went to 8 he put it in 6th.
Do you think my engine is damaged?
I don't have any issues now, at all...but you think it's damaged?