I found these remote filters which are a bypass type.
they seem to be the old toilet paper roll filters of years ago.

http://wefilterit.com/index.htm

Has anyone tried them?

They hook them to the oil pressure sender line and back to the oil
pan, is there enough flow there to make for usefull filtering and
where do you get oil pressure for the guage?

I have an O290 with an oil cooler and a screen, could it be hooked
inline with the oil cooler or would it be too restrictive?

In a past life I worked on transport trucks and serviced an oil filter
which used a canister with flinger inside which spun around by
pointing it's nozzle. The dirt would stick to the outside of the
canister which was cleaned by removing a paper liner.

Other than being iron, a bit heavy and having a moving part to wear or
break they seemed to work well. I was impressed with the layer of dirt
I pulled out with the paper liner.

Ray Toews

1965 Jodel F11 CF-OVJ