Motor oil.

 

By no means am I a master mechanic I can rebuild an engine and fix most anything. I've been building cabinets and working in a shop using air tools since I could walk. WD-40 3 IN 1 PENETRATING OIL? I can tell you from a red arss and experience that if you use wd pb 3in1 in any air tool it will swell the O rings and you will need to rebuild the tool.. Trust Me! Dealt Campbell devilblis denso pasload will not tolerate any type of PENETRATING oil. I don't own Snap on so I can't speak for them