OK, I am confused by this. The FSM says to add the oil to the compressor if I am replacing the parts mentioned, which now has 125 ML (4.2 ounces) in it. You are saying I should add the oil directly into the components. I already reinstalled the evaporator without adding any oil to it, but I can pull it back out and add some if that is the proper method.
No...don't remove the evaporator at this juncture. If the evaporator is the only component you have installed then you have two choices.
1. Remove the high side line (the lower, smaller line) at the firewall where it connects to the Evaporator and add the oil there (use a syringe).
2. Don't worry about it and once you have charged the first can of refrigerant into vacuum at the high side (engine off) you can rotate the compressor BY HAND (belt off) 15-20 revolutions to move some of the oil and liquid refrigerant though the system.
Why does the FSM tell you to just add the oil to the compressor if what you are saying is the proper method?
I have no idea what your FSM says (if for a 94 model) but I can tell you that 'current' best practice when replacing components is to add the oil directly to the component(s). This insures that oil 'return' will happen as quickly as possible. Otherwise...upon start up (full charge of oil in the compressor) you have essentially slugged the compressor.
The lubricating oil is meant to be semi-suspended (miscible) in the refrigerant and carried throughout the system (in a ratio) by the refrigerant. It isn't supposed to 'pool' (significantly) anywhere, although as the liquid refrigerant turns to a gaseous state when entering the evaporator some oil does 'drop out'. Also, at certain temperatures (Critical Solubility Temperature) the oil will begin to drop out. Starting up a new system with ALL the oil in the compressor is hard on the compressor at initial start up and only prolongs the solubility process. In short...there is a better way!
Also, I reused the shipping oil and just added a little ND-8 that I bought for this project to that.
ND-8 is simply Denso's version of PAG oil. Any PAG-46 is the same thing so don't bother chasing down ND-8.
Is the shipping oil the wrong stuff? Why would they put the wrong oil in the new compressor?
The shipping oil is 'supposed' to be the type of refrigerant lubricating oil appropriate for your system. But who knows its origin, quality or condition? All PAG oils are highly hygroscopic (attract water/moisture), so it is common practice among A/C professionals to dispense with the oil shipped in a new compressor and refill with fresh oil of known condition. But...I leave that up to you.