How much dirty looking is engine oil from an engine after 3000 miles?
If you have 2 cars (one is diesel and the other is gasoline) which
are subject to similiar driving conditions, how much difference in texture and appearance is the engine oil drained from each of these 2 cars (e.g. after driving for about 3000 miles)? Is it true that the engine oil drained from the diesel car looks like black mud while the one from the gasoline car will look dark brownish?
Thank you very much for your info.