I agree with Larry, my recycler catches the oil as it discharges the system and I have never had more than an ounce come out. It depends to a certain degree how fast you discharge and where the service ports are located.

As most systems only use 8oz or less, putting 4ozs in every few years quickly exceeds the full amount. I was always taught that too little oil was better than too much.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician