So I'm replacing an R-134 compressor and I read in the manufacturer's instructions that a compressor holds 60% of the oil. Thus in a 6 ounce system 4 ounces should be in the compressor. That is in direct contradiction to every factory manual I have. The factory says the compressor holds the least amount of oil. You drain the compressor, and if less than an ounce comes out, you add two ounces. If more than an ounce comes out, you add that much back. My system holds 6 ounces and since the old compressor held just a bit under an ounce, it should have seized up according to those instructions. It did not, it worked fine, I am changing it because the clutch went and a whole compressor is only a few bucks more than a new clutch. My gut tells me to stick to the factory specs and disregard the manufacturer's instructions. What do you guys think? EDIT: Yoiks! The system has PAG 100 in it and the new compressor says to use PAG 46. No way I'm flushing all the 100 out.
Last edited: