Hey Guys, Contrast a 'Spin on' filter with the MB 'Cartridge' design. The Spin on is one piece with 2 seal points- center thread seal and outer rubber ring seal. Simple, 3/4 turn seal, rarely leaks, no critical tolerances, cheap to make. The MB cartridge design has 10 or so pieces, very tolerance critical, replacement filter critical, etc. What washer, o-ring, filter, diaphram, etc. goes where? Leaks?? German engineering?
Which is better?
The MB 180, 190, 200, 220, 230, 250, 280, etc. in-line engines had many oil filter housing and cartridge filter designs. I think(?) some of the block mountings are interchangeable. Other considerations are oil cooler connections, full/partial flow, relief valve, oil pressure tap, etc. The various BBBs show at least 4 different designs. One of my favorites is the accordian diaphram on the top! All these designs are tolerance, spacing critical. Two of the three inch diameter o-rings in the top groove, wrong filter, wrong seal(?), clogged relief valve, etc and filtration is breeched.
My guess is that along about revision 'xyz' the oil filter engineer stuck a 1/2" washer on the stub to take up any slack to seal the filter for full flow.
Some of the MB filters came with 5 or so washers, seals, o-rings, etc. Some filters had half o-rings top and bottom, as I remember.
We all want our filters to filter and protect the engine. The 113's had various designs. So, the bottom line is - Make sure you have the right washer, o-ring, seal, etc. combo, so the top and bottom of the filter is sealed and the oil goes thru the filter and not the bypass.