Try 40 below from summit, it says that it will drop coolant temps up to 40 degrees, it also recomends that you use it with str8 water ( not in winter ), I would recommend using distilled water instead of plain tap water but, that's me. It will work with coolant as well. It's $24.99 a bottle and takes 1 bottle so, it is a little expensive but, it's not going to break the bank. Run a pusher electric fan along with a 17" flex fan on a thermal clutch, might help to.