A/C Service Oil Adjustment

Should an A/C compressor or other component require replacement, it's important to adhere to the oil charge table listed in the service manual. Each component retains a certain amount of oil even if removed and during replacement must be compensated for. For example, if a condenser is replaced in a Calsonic equipped '91 Legacy, 2.9 fluid ounces must be added to the system to compensate for the estimated amount of oil that will be taken out of the system when the original condenser is removed. On the other hand, since replacement compressors come with a full oil charge for the whole system, oil must actually be removed from the compressor to avoid overcharging the system with oil. Overcharging the system with oil will result in reduced cooling effectiveness while undercharging will result in increased system wear and possible failure.

Subaru recommends the use of a refrigerant recycling machine to help protect the environment.