86mm, 16 Flute Cup Wrench
3/8" drive required.
Suitable for BMW N52, N55 engines and more (check compatibility if unsure).
Many BMW engines make use of a cartridge oil filter, which sits in an oil filter housing attached to the engine. The lids of these housings have flattened edges, and are recommended to be opened using a cup wrench.
(Other housing lids may have a plastic nut on the top, which can be opened using a normal socket and wrench).