Car Detailing and Show & Shine Prep sponsored by Autogeek.Car Audio & Electronics sponsored by Bavsound.Tire & Wheel Forum sponsored by The Tire Rack.Suspension Tech and Handling sponsored by.Professional Motorsports sponsored by Bimmerworld.Track, Auto-X & Drag Racing sponsored by.General BMW and Automotive Discussion sponsored by Intercity Lines.Last edited by RocketSurgeon 09-14-2013 at 05:32 PM. Allow to cool and drain out Prep Fluid in same manner as old water-based coolant. Fill with Evans Prep Fluid (waterless flush) and run for 15 minutes to circulate. Use high volume air to force out remaining coolant. although honestly you should be able to achieve the same effect using pure coolant minus the water, although this would not remove as much heat and it may have a risk of freezing in cooler climates. Basic Installation Procedure: Drain all old water-based coolant out from radiator, block, and heater core if accessible. The Evans NPG coolant is nothing more than propylene glycol, which is available at a much lower price. It is difficult to say exactly what affect the Evans coolant will have on engine temperature. At a given engine temperature the temperature of the Evans coolant will be a little bit higher based on its lowered specific heat. randy has emphasized the difference between engine temperature and coolant temperature. This means that water can absorb a much larger volume of heat. 5, propylene glycol hat a specific heat of.3. the specific heat of water is one, while the specific heat of a typical coolant mixture is. here is where the problems start, the npg coolant is not as effective at removing heat as water. It is basically like using pure antifreeze with no water (the only problem with doing that is that it could freeze at somewhere near 10ยบ). Npg+ is a mix of ethylene glycol (coolant) with propylene glycol. First off, the npg is made from propylene glycol, think coolant's non toxic cousin. Evans is interesting stuff, I'm not sure what to think.
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