I’ve been mulling this over for awhile now. Aside from emptying each component of oil or at least trying to , how would you go about determining an oil overfill?

That seems to be a tough one. You can recover and reclaim refrigerant and some oil along with it, but not all the oil.

Radiator and or condenser are spotlessly clean.

Why are you undercharging it, factory unit? I don't worry about 300psi, if on the high side. Because with a full charge at working engine speeds high side pressures are very close to 375psi. I’d prefer not to need replacemnet parts because of a blowout. System vents excess pressure in that area 385...

Correct 60 percent of factory spec charge because of high condenser pressures. Factory charge is 2.2 lbs I have approx 1.3 in the unit now. just about all my a/c tools are robinair. Recovered and charged at least three times to discount air/moisture the in system. I’m leaning towards a bad expansion...

Kubota farm tractor does cool, just not well. Both low side and high side pressures are higher than normal. High side will approach 300 psi possibly more. The low side was maybe 60 perecent higher than it should be. Unit is not over charged in fact it’s undercharged by about 60 percent. Unit has bee...