Aftermarket oil filter fitting and flow.

[Leptons]

Oil temperatures on track seem to be getting a little high so I’m looking into fitting a remote oil cooler. The options for my car (e36 328i) seem to be to fit an M3 oil filter housing or use a modified oil filter cap, which I suppose is the equivalent of a sandwich plate.

My question is When using the sandwich plate type affair, how does the oil flow through the cooler? Effectively both ends of the pipes flow to the same place and I can’t see how the cooler gets a proper flow without using its own dedicated pump?!

[Leptons]

Interesting, I had heard the M3 housing needs fettling slightly. This is the arrangement I’ve seen, I suppose it’s like a sandwich plate in reverse but I can see how you get a genuine flow through the cooler. You’d be as well just drilling and tapping the housing?!