o-rings included with oil filter
I recently purchased a 2012 (F02) 750Li x-Drive.
I picked up a BMW oil filter and a Mahle filter (same filter but I bought one of each).
Both filters include the following:
- Filter element
- Copper Crush washer for drain plug
- Large O-ring for screw down filter canister housing
- Small O-ring
My question is what is the small o-ring for? On my E60 (different filter but same crush washer and o-rings) it is used on the filter cap housing. I don't see any need for the small o-ring.
I'm wondering if I'm must not seeing where the small o-ring goes OR if Mahle is just using the same crush washer and o-ring kit for multiple filters
Sorry if discussed before but I had no finding my answer via search.