Ac oil helps to keep the gaskets in the ac system from drying out. The oil can be added separately or can be bought mixed into Freon from the store.
Most importantly the oil lubricates the ac compressor, the only moving part in the ac system.
how much ac oil do i put in my ac copressor
PAG 46
The amount of oil charge required for an automotive AC system is specific to the car. There is not standard amount for all cars.
the ac slows the engine, the lower idle causes the lower oil pressure
ac pf 13
AC Delco - PF2135 FRAM - PH6017a
mineral oil
Champion Filters (not connected with Champion Spark Plugs)
PH4967 = AC PF1233 = NAPA 1394
AC Delco P 115
7 ounces
Ac delco's use to be good but not anymore, I use wix filters in my car and like them a lot better.