First off, please do NOT say "measure how much came out, and pour that amount back in." My AC system had NO oil in it, which is why it failed in the first place. I am completely overhauling the AC system in my 94 Explorer. Everything is brand new, except the compressor which I bought used, and the evaporator, which is the original (still need to flush it out). I need to know how much oil to add, and where to add it (a few oz's in compressor, a few in accumulator?). I already added about 1 oz to the condenser before I installed it. I THINK it uses about 7 oz total. Will some of this oil be lost when I vacuum the system down later?