Frantz oil filters and other gimmicks...

taylor47

If the by-pass or cartridge filter has a top mounted cover, shut the engine off and let it drain for 10 or 15 minutes then remove the lid, place a plastic bag over the filter and remove the cartridge with the bag, saves a lot of mess!

ltcolumbo

So, the oil is clean, but what about the depleted additives? It's quite a complex mixture.