Here are my thoughts on the cast and billet oil filter caps currently available. Long story short, I think it is best to stick with the OEM BMW plastic cap; even if that means buying a new one every 50K miles as preventative maintenance.
Draw your own conclusion and let me know what you think!
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References to others' experiences with these products:
Spool Street Forum thread: https://www.spoolstreet.com/threads/b...
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