We have a 2004 Mazda MPV with the 3.0 L Ford Duratec motor. Not sure what the best coolant is? The manual, I believe(it's not here in front of me), says to use "???ethyl or ethanol glycol or something like that???". I want to add some to the pressurized storage tank since it's a bit low. I do plan on flushing it myself this summer. Any recommendations for what to use?