Hill compressor crank oil

Hi all. I've got a Hill EC-3000 compressor and so far am liking it very much. I want to get some crank oil to have on hand. It is all out of stock in my neck of the woods. Pyramyd does sell it for $10/50ml. That equates to $200 a quart which is beyond ludicrous. Anyone know what this stuff is ? I believe it's only job is to lubricate the crank. The very best and most expensive compressors in the world do not use oil this expensive. Suggestions welcome.