Yesterday after I finished sealing up my EGR on the 240D, I drained my oil only to realize I had no spare filter on the shelf. I know I should only use the proper "filter" but I wanted to try out my new modification. So I ran down to NAPA and got their Gold series filter. Fit right in. Placed new 'o' on top. Getting the oil filter housing top on felt funny, but screwed down fine. Started right up -off I went. Just to the store to get some milk(only a few blocks). When I parked and got out I smelled oil Looked under the Baroness and saw a huge puddle of oil . After a dirty investagation I found the 'o' ring was not seated properly. So I walked over to NAPA and they were kind enough to give me a new filter , after looking up the part #,same as # before. They also gave me 1gal. of oil at 20% off. After a parking lot fix and adding almost 1 gal. I re-started and oil leaking out of the filter housing worse than before!!
I called AAA and got a tow home. The driver was able to follow my oil trail home. Scary.
Fortunalely I had not thrown out the OEM 'o' ring. And that fixed the problem.
In a side by side comparasion the OEM is a little thicker than the NAPA. NAPA gave me a refund and the store owner is filing a complaint with the corp.QA. on my behalf.
I almost killed my car, please learn from my mistakes

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2dieseljohn
1979 300sd (283,000+) Road Trips
1983 240D 4-speed (350,000+) Daily Driver
1967 E-TypeS1 in bits and pieces