I know what the requirements are, I read 9 oz's but how much goes in the compressor and how much in the dryer? I will be replacing both! Will there be oil left in the system once i replace these two things? I'd assume some in the condenser? I dont wanna add the wrong amount any help is appreciated! My boss is letting me use his ac machine but isnt gonna be around to teach me the ins and outs of it!