Looks like this one doesn't oil from the engine like the newer ones do and it appears to be air cooled instead of water cooled. The governor which is the thing on the side of the compressor toward the firewall looks like current production ones. If it ever quits pumping, that will probably be the cause and they can be bought at any heavy truck dealership for about $12. Other than that, check the oil regularly like you would a shop compressor and you will probably never have trouble with it. Sounds like you made a heck of a buy.
