I have 560sel with R-12 A/C. Site glass showing lot of bubbles and very low cooling. I decided to put Duracool. Should I just drop it in or empty the system pull vacume and then charge with Duracool? How about putting Propane since both are almost same? Folks! I will not put R- 12 period.

Another Question- Is it possible to drain oil from the compressor without removing it from the car?

Sahai