I'm not sure if this is still an issue- the green goo in scroll units. I am replacing a 2-yr old 4 ton 3ph compressor in a Trane a/c and was notified by T that the green slime is an oil additive for the bearings, and that if there is not a crankcase heater installed, the additive will congeal and could get out into the system. Also that liquid floodback could wash this stuff out and into system. Also the effect was noticed more on larger units(10-15 ton). Maybe true, maybe not-company line. I'll find out Monday when I open the unit up-this one has ccase heater.