Oil Cooler Line-to-Oil Cooler O-Ring - E9X M3, F10 M5, F13 M6
Seals each oil cooler line to the oil cooler. Genuine BMW replacement for BMW part #17222284079.
E90/E92/E93 M3 oil leaks where the lines attach to the oil cooler may be from this small o-ring. Rubber o-rings will harden and shrink over time, which lets oil slip past. This is a new Genuine BMW oil cooler o-ring to stop the leak. These should also be replaced any time the oil line and cooler are separated (do not re-use old o-rings).
E90 / E91 / E92 / E93 (06-13) > M3
F10 / F11 (11-16) > M5 (2013-2016)
F12 / F13 (12-18) > M6