The turbo on BMW 320d failed after 7 years and 53,000 miles. A new unit was fitted but the engine ran roughly and misfired. A scope fed into the inlet manifold revealed that a flap valve was missing and the mechanic's diagnosis was that this was responsible and the damage was irreparable. BMW is not prepared to offer a goodwill financial contribution and without a running engine the car is now only worth scrap value. Is this refusal to help reasonable given the rarity of such an occurrence?