I have used 10% waste oil
cut with diesel
run through a 30 micron (Agricultural tractor filter) followed by a 10 micron (Racor) then a 2 micron (Marine) filter on my boat.
I run even fresh diesel
through the 30 micron before it gets into my tanks
. Lotsa "crud" in 3rd world diesel ! I add a half pint of methyl alcohol to each 65 gallon tank plus an ounce of Biocide. Engine
is a 4D 61 Lehman
Peugeot (2112 Indenor), runs sweet as a nut.
Filters don't last as long and don't run 140 EP gear oil
in the "mix" it makes the eyes of following skippers run a lot and is hard to explain to them !