have a 92 with the nippondenso compressor. replaced bad seal and changed dryer. need to know correct amount of oil to add to each.did not change to 134a, kept R-12 system. thanks in advance and very glad to join this group.

 

i have a 1990 factory gm service manual i know yours is a 92 . but nowhere in the manual could i find anything on how much pag oil to add . but remember unless you evacuatev the entire system the only oil you shuld have lost is what was in the dryer you replaced .oil does not evaporate like freon does . its been a long time since ive done any a/c work but i think a bottle of pag oil is 10 to 16 ounces & thay is all you should need if you need any at all.

 

If you did not change compressor, you should add about 4oz of oil. Do not use PAG oil if you are still using R12. It should be a mineral oil based refrigerant oil.