ATF is very lubricative, in fact, many use it for a lubrication additive when they fill up to counter ULSD. NO, 2 quarts of ATF will not turn 20 gal of fuel red enough to turn the lawman red. I work for a diesel mechanic and we frequently put Allison Trannys in buses, we don't build the tranny, just swap them, and if you pull the oil pan down on a brand new rebuilt tranny that has never even been run, only tested, it already has metel particles in in the tranny pan. I would not reccomend using any used oil, tranny fluid, or anything that has been in an engine or mechanical maching before.