adding oil to ac/compressor without discharging

[kuene]

is this feasible with an r4? If I filled the lines with some oil before hooking up my gauge set - would that work?

I had a spill mishap when originally installing my compressor last year and I've always felt I'm an ounce or two low on oil.

[Diseasel300]

Let sleeping dogs lie. You're better off with slightly too little oil than slightly too much. Liquids don't compress and you don't want the coils oil-logged. If you had a problem with oiling, you'd know it by now.