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I used to recommend changing coolant every 30,000 miles or three years. But as coolants and engine technology continue to improve, I've softened my position on coolant changes. Assuming a long-life coolant and 15,000-25,000 annual mileage, I'm willing to go five years now — a huge step for me.
So how does universal coolant compare to green, orange, etc., types of coolant? There are basically two technologies for corrosion protection in engine coolants — inorganic and organic. The conventional antifreeze used for decades, which is usually green in color, utilizes silicates and/or phosphates to protect the various metals used in engines and radiators.
The so-called long-life coolants — often orange in color - introduced in the mid-1990s utilize organic compounds to provide anti-corrosion protection. The benefit is these compounds last longer, thus the extended-life concept. There are also several hybrid coolants used by several carmakers that combine both organic and inorganic compounds.
Universal coolants typically use organic compounds like long-life coolants and claim to be compatible with any coolant.
As confusing as the different coolants can be, remember three important things: You own and are responsible for the vehicle; if the cooling system contains any conventional antifreeze, change it every three years; and, finally, no coolant is permanent, or capable of lasting for the life of the vehicle.