SOTP address (State Of The Parts ). oil filters
Not necessarily bashing Ford, they made some cool cars. But, getting to the story... coworker buys Ford Performance oil filters for his 'stang. These are expensive filters and must be ordered. Can't get them at the local parts place. Put a new filter on his car. Drove around for a day. Noticed a small but persistent oil seep from the base of the filter. Filter was properly installed. Took it off to find the problem.
*rubber seal removed for better viewing*
The filter with the round holes was the one removed for the oil change. The one with the oval holes is the new one. Notice the crimp on the new filter. Some type of machine did that. He has to order another filter to see if that's how they're made now or it's manufacturing error. If it's an error, I'd think QA would see that?