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Q:I have owned a 2003 BMW R1150GS since it was new, and it has been my favorite bike of many I've owned. I recently had to have it rebuilt (at 63,000 miles) after oil-related piston failure, which was a surprise to everyone. It was always maintained well and run on synthetic oil since break-in. One interesting fact: My bike has never held anywhere close to the recommended amount of oil. It has always dropped the oil level to close to a quart less by putting it into the airbox and/or burning it off on start-up. Several very experienced BMW mechanics have told me it is not unheard of on this bike, but I am concerned, as it still has this characteristic since being rebuilt. I have been told that as long as I can see a bit of oil in the sight glass, all is fine, and that adding more oil will result in what I described before. Time for a new bike? Or just ride it with an eye on the oil level?