Compression of Non-Refridgerent Gasses (Different Oil?)

Hello everyone,
Quick background, I'm an electrical engineer developing a gas recovery and compression system - I have no condenser or anything like that. It is an open system. I take inert gas from an inlet around atmospheric pressure and use the compressor to boost it up to 200-300psi.

The recovered gas stream will have a moisture content substantially above anything that would be considered acceptable and drying the incoming gas is not an option. It would seem that the specialized oil polyester oils are designed mainly for compatibility with the refrigerant at the expense of sensitivity of water.

Thus my question is: can I just replace the polyester oil with an oil that is less sensitive to water (won't turn acidic)? Not to be so crude, but an 10-40 or something similar?

Thank you,
Dean

Something like Suniso 3GS mineral oil and change it regularily would be better than synthetic oils.

I did have a customer that ran his old frigidaire on duckhams hypergrade but thats another story...