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I just do not want to break something that doesn't come apart if I've never had that cap apart before. Past posts on this subject had quite a few conflicting answers about the 5th 'O' ring. One time, I looked to see if the part was able to separate in the cap but stopped short of breaking something. I just could not see how it was connected. Plus, there also were a few pictures posted by other members (again, long ago and I do not have a reference) that there was a 'cap' above on some members cars, that might have came from another car, that had it's own 'O' ring that could be changed. The Mann filter is spec'd on quite a few MB vehicles, so I'll just do the 4 until I get something concrete (like some really good close-up pictures that demonstrate how the post comes off of the OEM cap).... Thanks for the reply Dennis.


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