Its very dependent on the engine.
Use a 5 micron filter, 10 at worst.
I back burn my motor oil at 10:1 in the 6.5 but would never in a VW TDI
The old mercs would run on nearly anything.
Somebody (here?) Worked at a shop and would mix barrels of used oil with tranny fluid to get a decent viscosity and burned that for years.
What engine are you contemplating ?
Does it use single hole or multi hole injectors ?
Biggest question is what pump is on it ?
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