Would anyone out there know whether my 89M3 that I just bought 3 months ago is burning oil excessively. I had the oil changed just after I bought the car and 4000km (2400 miles) later, it is down 2.5 litre or quarts of oil. My experience with BMW's (have had 4) suggest that this is excessive but I have never dealt with a high performance motor before. A friend of mine in the engine rebuild business said high performance engines often use 1 litre of oil per 1000km. What is your experience?