Inconsistent oil levels in your BMW R1150RT could be attributed to several factors. Here are a few possibilities:
Oil consumption: Motorcycles, especially older ones, may consume some amount of oil over time. If your bike is burning or losing oil, it could result in varying oil levels between checks. Keep in mind that some oil consumption is normal, but excessive consumption could indicate a problem that requires attention.
Oil foaming: Excessive foaming of the oil can lead to inconsistent readings when checking the oil level. Foaming can occur due to several reasons, such as overfilling the oil, high RPM operation, or issues with the oil pump or lubrication system. If you suspect foaming, it would be worth having your bike inspected by a mechanic to identify and resolve the underlying cause.
Inaccurate readings: It's essential to check the oil level correctly to obtain accurate measurements. Ensure that you follow the manufacturer's guidelines for checking the oil level, including proper warm-up and wait times, using the correct dipstick, and checking the oil on level ground. Inadequate or incorrect checking procedures can lead to inconsistent readings.
Oil leaks: If your motorcycle has oil leaks, it can affect the oil level in the engine. Leaks can occur from various points, such as gaskets, seals, or even the oil drain plug. Inspect your bike for any signs of oil leaks, such as puddles under the bike or oil stains on engine components.
If you're experiencing consistent issues with inconsistent oil levels, it is advisable to have your BMW R1150RT inspected by a qualified technician. They can diagnose any underlying problems and provide appropriate solutions to ensure proper oil level maintenance.