I installed a new GM condenser and dryer. The Haynes manual says to put in 1oz. of new refrigerant oil in both along w/ coating the new o-rings w/ it. The GM service manual states to use refrigerant oil on the threads and o-rings but not to get any oil in the system BUT states to add PAG oil into the system but not to get any on the threads. I ordered both from Dal and all he sent me was a black bottle called GM Refrigerant Oil R134a Systems. What do I use and where? TIA