Virgin Mercruiser oil filter cut open. This filter is commonly used on GM based marine engines of the 90's to 201x's, 4.3 V6, 5.0 and 5.7 V8 and 7.4 454. Similar spec filters are the M1-111, AC Delco PF454, Wix 57099, Amsoil EAO59, My personal observations are: can is a bit thinner than premium filters, nitrile rather than silicone ADBV, no bypass valve, and that odd end plate with the sheet metal cap. The specs for this engine do not call for a bypass valve. Its an average filter at a premium price, and I see nothing to strongly recommend it considering it is commonly $11-16+. I generally use the oversize M1-302, Amsoil EAO24, or Fram XG5. Can anybody tell me who makes this filter ?