What do you use to lubricate rubber seals and O-rings for R22 systems. Mineral oil, Vasoline, Silicon Grease or Vacuum Pump Oil.
Is one of these lubricants better then the others to help get a tight seal, protect the O-ring and be compatable with R22 systems. (however we're only talking about 1 drop or two per fitting)
Yes I know that you can special order fancy O-ring lubricants but I want to limit my choices to the above or something else that's fairly common.