I have a 2005 model, 1200 GS with 8700 miles that seems to consume significant amount of oil. BMW recommends oil changes every 6000 miles, but when I checked my oil at 4900 miles, I was 4 liters (four quarts) too low. Yesterday when I was checking my oil level again at 8680 miles, I was low again about 3 liters (three quarts). Is the large consumption of oil normal? I do not have any leaks, nor do I see any excessive burning. Thanks for your feedback.