I just recently got this vacuum pump at an auction for cheap and with the intent of using it for a vacuum chucking system. Can I use this type of pump or did I make a wrong purchase? It is an oil displacement pump so when it's running, oil mist comes out the exhaust. Any other help and advise on putting together the system would be greatly appreciated. Sorry, I tried to post pics but the program said they were too big. It's a US General 2 stage 3CFM pump. According to the directions, it's used to work on refrigerant systems.