I'm now a guy with a compressor

Thanks for the feedback fellas. Yeah, the owner's manual said you can use 10w-30 or even 5w-30 but it has to be fully synthetic. Of course they say to use compressor oil, but a 10 oz bottle is the same price as Mobil1 32oz of synthetic.
Ok, so I need to keep it under pressure. But release pressure on the regulator?
So what pressure should I run on? I adjusted the regulator to 90psi.