Hi, just recently got my first BMW.
The previous owner (father in law) stopped driving the bike some years ago as he believed there was an unexplainable oil consumption, which he did not trust....
The bike has 175K km's on it, and has a beautiful grey exhaust internally (my father in law never drove the bike less then 400-500km's a day, when he drove it), so I do not believe it is burning the oil via the valve seals.
When starting it up for the first time today in quite a few years, it started immediately, a small puff of blue smoke, but then ran very smooth for about 25min (idling and revving modestly through the gears while standing still on a motorlift). The was no external oil leak to be seen.
Is there a possibility that the engine oil can leak internally? If so where could it go and how could I check this?
More in general, how much oil can a bike with these km's consume typically?
Many thanks, Piet