[nazali]

So I'm seeing 2 things (both from bimmer world)

a 27mil and 32mil

(2020 230 f23 b46)

CTA Tools 27mm Socket for Oil Filter Cover/Cap - B46 B47 B48 N47 N57
This low-profile 27mm cap socket fits the oil filter cap on BMW B46, B47, B48, N47, and N57 engines.
F22 / F23 (2014+) > 230i xDrive

Engine Oil Filter Socket, 32mm, 6-Point, 3/8" Drive
Socket For Oil Filter Housing Cap - For Cars With 32mm Hex On Top Of Filter Cover which include the BMW M52, M52TU, M54, M57 (diesel), N47 (diesel), N57 (diesel), B48 4 cylinder, and B58 6 cylinder engines. These engines span 1996 through current models. Be sure to check the list of vehicle fitments below when ordering or check your oil filter housing cap to make sure it has the 32mm hex head.
F22 / F23 (2014+) > 230i xDrive

[nazali]

Looking around I think it's a 27, Canadian tire does a set of extra large sockets & oil cap removers for around the same price as one of bimmerworlds ones (29 bucks)

so I'll pick up a set, the set also has a 27 and a 32

[nazali]

interesting that NewTis doesnt give a spec on the socket size

[MarcoZandrini]

My car's filter cap uses a shallow 32mm socket.