It depends on the compressor. Consult your local auto parts store for the correct oil. It could be 46, 100,150 PAG or a Hybrid POE oil.
R134a R134a freon and also don't forget to add oil as well..........
No
refrigerant oil has to do with A/C and is is R134A bit motor oil is 5w30 all year
You can use the same high and low sides but recover the freon very slow because there is no way to recover freon without removing the oil as well.......
Just use a universal ester oil will work but I would really need to know what type of vehicle you are working on.........
It's only Freon if it was manufactured by DuPont, but to the important things... Your 89 would have had an R12 system from the factory. You can't use R134a in an R12 system unless you do at least a partial retrofit (evacuate all the R12 and compressor oil, replace the orifice tube, replace the accumulator, replace the hose connections, add PAG oil and R134a).
PAG, the same as any other R134a air conditioning system.
The 134a plus just has PAG oil added already, so that you (theoretically) don't have to add it after adding the R134a.
Freon R12 refrigerant is so very expensive that I recommend you have the A/C converted to R134a. But first you must have the leak repaired. The shop will then remove any R12 left in the system, flush the system to remove the old oil, install fresh oil that is compatible with R134a, and charge the system. If there is any R12 left they may pay you to recover it.
YOU WILL NEED TO FLUSH THE SYSTEM TO REMOVE THE OLD OIL. ALSO INSTALL A HIGH PRESSURE SWITCH AS REQUIRED BY THE EPA. THEN INSTALL CORRECT AMOUNT OF OIL COMPATIBLE WITH R134A. CHARGE TO ABOUT 80% OF R12 BY WEIGHT.
Depending on the system type - A Freon gas - R134a (R12) P.A.G Oil High Pressure Pipes Low pressure pipes Compressor Condenser + Condenser fan Receiver/dryer - including a 'desiccant' type substance (Calcium oxide) Expansion Valve or Orifice Tube Evaporator Geoff3bee
too much oil in system or compressor not working properly are some possibilities