There is a drilling in the side of the plug in which you can put a size 3 Allen key or a Torx key T10 (usually found in the your BMW toolkit) in order to fit and remove it.
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Also referred to as oil filler cap.
These covers for the open holes of the rear engine mounting...
This adjustable licence plate bracket is made of...
These crash protectors for forks are made of cnc lathed...