Bloke at work told me his wife's BMW diesel company car had needed the whole fuel system replaced due to someone in her firm having used it and mistakenly filled it with petrol. He had realised his mistake and had it drained on the forecourt before actually running the engine. However the draining could not have been 100% as a few months later the high pressure pump failed, it had worn due to small traces of petrol and produced very fine swarf that was returned to the tank. BMW dealer said only way to fix it and not have it come back dead again and again was to replace the whole fuel system including injectors, 3 pumps, tank and all fuel lines. Total £5000 and not a warranty job. As it was a few months later it's impossible to prove that the draining had not been done right or that no one else had put petrol in it.
This sort of mishap is clearly expensive on modern common rail diesels. Even worse for 2nd or 3rd private owner who buys a car just after it had been filled with petrol so it dies horribly in the first month of ownership, they would wind up with this massive expense. How would someone that had just bought a 2nd hand one prove they hadn't put the petrol in themselves and that it was sold defective?
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