I could be completely wrong but 120 ml? That's the amount the A/C conversion kit contains.
Thanks for the reply, Gold! 120 ml seems to jive with the service manual assuming you're replacing (or flushing) the: condensors (20 ml), evaporator (10 ml), receiver (10 ml) and compressor (80 ml).
I was looking at the 1991 Service Manual and it says to add this much oil after replacing the following parts:
Condensor 10 ml
Evaporator 10 ml
Line or Hose 20 ml
Receiver 10 ml
Compressor - measure the volume of oil drained from the old compressor, subtract that volume from 80 ml, then drain the difference from the new compressor.
With this compressor subtraction procedure, I guess the manual assumes the compressor normally holds 80 ml and if you can't drain that full amount from the old compressor you removed, then the rest of the required oil must be elsewhere in the system? Seems a strange procedure to me.
Why can't they just say how much oil the entire system should hold?
Also, regarding the instructions to add 20 ml when you replace a line or hose, there are 6 pipes and 2 hoses, all of varying lengths and volumes. If I add 20 ml for each one, that's 160 ml, which seems way too much. I have an 8 oz. (236 ml) bottle of Ester with dye, which is surely enough, but I don't want to put in too much and displace the volume that freon should occupy.
Can someone who has a conversion kit tell me if the instructions specify how much oil to add?