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Maybe its the additives then... but I cannot filter gear oil as quick as motor oil. Gear oil will almost ball up in the poly filter and take much longer to get through a 5 and 1 micron filter. Oil I essentially pour through. These bag filters are much finer mesh than anything in the deuce.

The carbon in used oil is less than 1 micron... so unless you centrifuge it or polish it through multiple 1 micron filter passes its always there. I don't think that it would wipe out a IP that quick... unless it was on the edge of failure anyway. My take is is gear oil is typically 80/90...