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Got a small oil leak or moisture around the top of your BMW's engine where the dipstick goes in?
It's probably that little O-ring.

This is a set of 2 genuine REINZ replacement O-rings for the upper oil dipstick seal.
The BMW part number is 11431717666.

REINZ is a top-tier manufacturer of gaskets and seals, so you know you're getting a quality part that will seal properly.
It's a tiny part that makes a big difference.

Instead of just wiping the oil away, replace that hardened old O-ring.

It's a cheap, easy fix that stops the leak at the source.
Get a set of two so you have a spare for next time.
Keep your engine bay clean and your oil where it belongs.
4 out of 5