I am reasonably sure that the material has to be coolant filter rather than oil filter. Maybe you can get a coolant filter to spin onto the oil filter base.
Down side is the velocity thru those spin on coolant filters is unlikely to "stir" all the large particles up into there, where as an inline coarse filter coming out from engine is guaranteed in the primary flow location to catch all the medium and large "stirred up" debris.
The spin on filters are put in bypass mode like an offshoot of heater lines and deal with minimal pressure differential to slowly pass fluid to trap fine silt and similar over along period like 6 months or a year. They would not allow enough flow to accommodate direct inline of main radiator hose. You probably already know this stuff but I thought I'd ramble on for a bit.. :)
Would a dual remote oil filter be up to the flow of a radiator? They are pretty cheap. Even in a bypass series setup they might work? Or would water just turn the paper element to pulp?
