You can install this oil level control (also called oil level glass) if your original oil level control is broken or yellowed. Exchange it when you do your next oil change. Sometimes it is easier to break the glass of the old oil level control in order to remove it.
Outer diameter: 40mm
259S R1100S 98- (0422,0432)
O-ring 52x2 for throttle housing
Compare BMW part...
Spark plug cover for double spark ignition
BMW...
Protection cap for throttle housing (2 pieces)
...