I have a '91 CQ AC oil related question. The system works extremely well. Pressures are 30 and 150. But, I am unsure if my AC system has enough PAG oil because of the following: Hooked up the AC and evacuated 1050gms of 134a. Then immediately refilled it with 750gms of 134a. Would the system now be low in oil? Do you need any other information? Chris