I'm not exactly sure what you're trying to accomplish here. The ac compressor is noisy, so you just want to add oil? Is it leaking refrigerant somewhere?
AC systems are not like engines, in that you can't just say "hey guys- what oil do ya'll think I ought to use?". You can't just do an 'oil change' for your ac system.
A given ac system is designed to use a specific type and viscosity of oil. Unless your system has a leak or you've been changing parts, it likely still has the correct amount and type of oil in it- I'm not sure that adding oil is going to do anything for you. But if you DO feel the need to add some, you're going to need to do some research and see what kind of oil that system came with- I don't know. PAG 100 would be my guess- it's probably the most common. But you need to find out for sure. A factory service manual would be the best source of info. Auto parts store might be able to look it up for you. Automotive forums specific to your vehicle might be able to tell you- but take that with a grain of salt.
Whatever you do- DON'T just dump some POE oil in the system because 'bullwinkle' told you that that's the thing to do.