Air compressor oil

I have bought 30w oil before and it said right on the container for small engines and air compressors that require a non detergent oil. I also just changed oil in a couple industrial sized machines and ISO 60 is required for those. Manufacturer / supplier recommendation.

This is a crank case, very similar to your engine! It has a crank shaft and connecting rod / rods. It is a splash lube system, (no oil pump).

Air compressor experts feel free to correct me if I'm wrong! :)