Wrong oil in the compressor

You need a very precise measurement of exact amount of refrigerant and oil. Because the system is a variable pressure system you can't use pressure to determine if you added the right amounts.

 

If the wrong oil has been put in the system, and is discovered quickly, there may be some recovery possible. This thread links to an article where a shop added around 150 ml of the wrong oil to a system, used the car for a couple of days, then replaced the compressor and flushed the entire rest of the system using a HECAT H-1000 flush system, and recharged it with the correct oil. The system was still ok 49,000 miles later.

Replacing the compressor may be an expense, and I do not know whether HECAT flush systems are available nearby. But it is less labor and expense than having to replace more of the A/C system.