I've read the David Urban write up and several other conversion pieces. Here's my question: "Is draining the oil from my existing compressor and refilling it with the new oil considered, 'replacing' my compressor?" Common sense tells me that replacing a compressor is getting a new or rebuilt unit and installing it. What throws me is that if one 'replaces' the compressor they are not supposed to add oil to the new accumulator/dryer. Well, if I drain my compressor of the old R12 oil, am I supposed to add oil back to the compressor? If I add oil to the compressor, do I not add oil to the new accumulator/dryer? Do I add oil to both? Thanks, JB