1999 Mercedes Benz C230 A/C Compressor

This video will show you how

https://youtu.be/_pBoAA87gHI

Let me know if you need anything else

You're right, it would be very expensive to have bought one and then screw it up. However, I have already been told by my mechanic that the car is a money-pit, so I'm going out on a limb anyways. I just want to fix the a/c so I can sell it (I'm in FL, someone would have to be insane to to buy a car without a/c here). I have instructions from a repair manual for it but the only thing it says about the oil is to "Install new O-rings lubricated with suitable compressor oil" Is it really that simple? I was pretty sure oil needed to be in the compressor (not just the O-rings) for it to run well and keep running.

I'm not sure why it failed, but the air filters (cabin and main) had never been replaced (on my 11 year old car - GROSS) and the car has 250,000 miles on it, figured it was just age and not being taken care of properly. The compressor in it now is leaking badly. Put refrigerant in and it poured out.

REFRIGERANT OIL NOTE:For compressor applications, see COMPRESSOR APPLICATIONS article. DO NOT exceed A/C system refrigerant oil capacity, when servicing system. See REFRIGERANT OIL & REFRIGERANT SPECIFICATIONS article in GENERAL SERVICING. Only new, moisture-free refrigerant oil should be used in the air conditioning system. This oil is highly refined and dehydrated so moisture content is less than 10 parts per million. The oil container must be tightly closed at all times when not in use, or moisture from the air will be absorbed into the refrigerant oil. Mercedes-Benz Drain, measure, and discard refrigerant oil from old compressor. Drain shipping oil from replacement compressor into a clean container. Add refrigerant oil to replacement compressor equal to amount drained from old compressor, plus 0.7 ounce. If a sudden refrigerant discharge greater than 1.4 ounces has occurred, add 1.4 ounces of refrigerant oil after repairs. If a slow refrigerant leak less than 1.4 ounces has occurred, add 0.7 ounce of refrigerant oil after repairs. If any other components are replaced, add refrigerant oil as specified. See COMPONENT REFRIGERANT OIL CAPACITIES (MERCEDES-BENZ - NIPPONDENSO) table.