Hi group I use a Motorgard filter on my 85 Mercedes. Works fine.
To clean motor oil for fuel usage, I am cosidering useing a Gulf Coat filter, they use paper towel rolls. A small capacity pump from graingers to recirculate the oil repeatedly untill the pressure drop across the filter stays low.
I bought a skinner II centrifugal filter for the car but I deceided not to install it on the car because while they get the oil very clean they don't remove any water from the oil. The Skinner filter is original equipment on many diesels like Mack trucks.
In the 70s I was in the army stationed in Korea. We were suposed to make a convoy run to rotate the missles into the depot for maintanence. They had to go, no delays! We got the convoy loaded and fueled except for two trucks. Both were empty of fuel. We filled one with Mo-gas and the other with 30 weight motor oil. They were Mulifuel engines-Right!
They both made the trip of 250 miles. They one with gas needed the injecters and pump rebuilt after retiurning to home.
I drove the oil fueled one It was ok under load there was the normal low smoke, but when the truck had to idle(I did'nt dare shut it off for long) the exhaust went white. Quite a lot of white-light grey smoke. When we got reloaded and returned to our home post it only took a mile or so to get back to normal exaust.
So the point is the listers, after starting on diesel and a warmup should be OK! Heated fuel lines would be a good idea,before the filters.
Dennis