21-05-15, 12:18 AM
Oil shouldn't go black that quickly, had many bikes where the oil stayed clean and i think they were 8000 mile intervals and they didn't burn any, they weren't Yamahas though. The job the oil does in a petrol engine is a bit different to a diesel, with a diesel the carbon is supposed to end up in the oil. I think in some cases not using the correct oil don't throw up problems for the individual user, once had a car that was sweet as then decided it was ok to use a certain Comma oil in it, knackered it.