This was my thought as well. I drained some oil at 30 hrs and put some samples in clear glass jars for a humidity testing. Left them for a couple of months and there was a sludge layer (lead?) in the bottom of the jar. Diesels use bypass filtration for long(er) life and TBN (total base number) monitoring of lubricants for drastically long oil changes. Also they have very large sumps compared to aviation engines. None of this field data (of which I am aware) would support benefits for our Lycs.
Further, the over the road diesel engines are not" large clearance" in any sense. Europeans use centrifugal filters in bypass but have not gathered large following in the US. They do the best job of getting small stuff out of oil and would be perfect for our engine, except for the G thing. Kidney loop shop based systems are very practical and cost effective for off highway to extend life of the products. Not so much for engines.
It "might" be functional for a Lyc, to hook up every time it is parked (at home), but again it just becomes and external sump and perfect oil only leaves the engine at risk to the next thing down the list. I sketched up a kidney loop with centrifugal filter for my -7, priced it and then abandoned as more overhead with a decade return if any.
There is proven data that circulated soot from diesels effect wear in micron clearances of fuel systems, but not sure it is applicable to lead suspension.
