Yup, I like to take stuff apart and oil filters are no different.
So here's what the OEM oil filter looks like after 14,000 km (~8,700 mi). Guilty as charged: I took it a bit too far this time, usually I change oil per the recommended 10k km (~6k mi) interval.
With the OEM oil filter I mean these three that are all identical except for the printing and packaging.
Volvo 3517857
Bosch P 3219
Mann Filter W 917

For those interested: the photos of the teardown are here.
This is not a very large filter. Yet the filter element was a bout 5 cm wide (~2 in) and stretched to about 3.7 m (~12 ft)length. Some lesser quality filters (FR#M?) might not come close to the total filter area...
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