Mcs in garage with few probs. had phone call! Build up of carbon. Warranty doesn't cover de coking ( think that's the correct term). Cost ) £1300 . Keep the car I said because I haven't got that kind money. Phoned BMW head office told them the problem and the fact they said my daughter doesn't give it a good run that's why it's build up. She does give it a good run out and has put 10000 miles on it in 9 months. Anyway as a good will gesture BMW are covering cost. I am one relieved mother.
the reason for the carbon build up,it is a direct injection engine so there is no injector wash cleaning the valves from the oil mist which are sucked in from the crankcase ventilation system..
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