Originally Posted by DuckDownItsPaint
Grease only. Why take the chance?
Oil will combust at high temperatures OR high pressure (which results in high temperature). The pressure coming out of your tank into the ASA is anywhere from 400 to 1100+ psi, depending on your tank setup.
An exploding tank can kill anyone close.
I would never oil the bottom half of my gun...(Anything to do with the air)
Although I doubt it would explode it could.