Well, I don't know where the requirements came from, but a non detergent SAE 30 is quite different from a SG/CD Heavy Duty API oil. I agree with the others, use Amsoil compressor oil- can be found in quarts in SAE 20 (ISO 46) or SAE 40 (ISO 100). Mix 50/50 for a 30 weight (ISO 68). That's what I do. Go to Amsoil's website or call them to look find a local retailer or dealer. I have a retail account with them but am not close enough to you.