Change from R12 to R134

[Giulio]

"Hi,I have a dual system in my refrigeration freezer. One is a mecahnical compressor (Frigoboat) and the other is a 117V seled compressor(don't know make). I had to change the engine driven compressor so I bougt a new one. The old one used R12 and the new is for R134.The system has a single evaporator circuit ( two Holdover Plates). I clened everything but now I have to change oil to the 117V compressor, can it be done? and if yes how?thanksgiulio"