I would warn anyone with 950-990 adventure with coolant leak, especially if unable to find leak.
when the water pump shaft is worn, coolant leaking inside the engine, but can not see any difference in oil,
so my opinion, as a car mechanic, oil filter will become clogged,because the engine has poor lubricating
and going to get a cam shaft damage same like my did.That is why I recommend replacing the water pump
every 20 to 30 000 km, do not wait for the engine damage.Replace the water pump is no problem, and costs no more than 50-60 usd