VTech Radiator Additive is specially formulated to protect your vehicles cooling system. Use instead of water to prevent harmful impurities from entering your vehicles cooling system. VTech Radiator Additive requires no pre-mixing and is ready to use. Our unique formula will protect the cooling system against corrosion or scale build up. Recommended for radiator type cooling systems in combustible engines of passenger cars, trucks, and stationary engines. Can be mixed with any antifreeze at preferred percentages or used on its own in moderate to hot climates. Available in factory GREEN or RED fluid color in clear or yellow bottles.