Just put freeze 12 in a C51 fridge , changed out any R-12 that was in it for the years before.  Prior to the swap the compressor ran fine plugged into a GFCI outlet. Now with the Freeze 12 in it the compressor will trip the GFCI outlet, but will run fine on a regular outlet.

That's not my only problem I let it run over night on a non protected circuit ad checked on it in the morning the low side pressure was down to 10 and high side 50  The compressor was still running and nothing was cold. Pulled a vacuum on the system showed a small leak that was not there the day before. So I took the plunge and removed the old compressor caped the lines and pulled a vacuum again , no leak So today I will be installing a gently used compressor from a don er frig. Only thing is now I have to order more Freeze 12 since the old compressor developed an internal leak. I hope this fixes it.