My M6 developed a thirst for oil at just 1,800 kilometres and used an average of 1 litre of oil per 1,000 kilometres until BMW agreed to replace the engine. A combination of having to stop every 1,000 kilometres to top up the oil and a faulty tyre pressure indicator made BMW's fastest convertible actually slower on trips than my daughter's Smart ForTwo. Add to this the fact that BMW Australia apparently don't stock parts and the fact that you can't buy tyres for them and you've got a car that reminds me of the old Jaguar joke that you need to buy 2 of them so you'll always have 1 to drive while the other one is in being fixed.
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