Who should I believe? Will it really result in corrosion if used more than temporarily? This patented formula provides a high degree of performance durability and carefully balanced protection against temperature extremes and rust corrosion of all cooling system metals, including aluminum. Prestone® Extended Life Antifreeze/Coolant is compatible with ANY antifreeze/ coolant – regardless of color – for use in ALL makes and models of cars and light duty trucks. On the other hand, Prestone claims their green coolant is harmless: The growth in the number of available antifreeze/coolant formulations has forced manufacturers to use different color dyes for different types of antifreeze/coolants.My car's manual says to use the blue Honda coolant: Since both water and antifreeze/coolant are colorless, manufacturers add a colored dye to the solution so the user can differentiate between it and other under-hood fluids and more readily know if a heavy duty engine is experiencing a coolant leak. These coolants typically provide 600,000 miles or 12,000 engine hours of service life, but their performance life can be drastically reduced if contaminated with nitrite-containing coolants. Organic Acid Technology (OAT) has no nitrite added. The ELC antifreeze/coolants use organic acids (organic additive technology), nitrite and/or molybdenum as part of their inhibitor package and are referred to as Nitrited Organic Acid Technology (NOAT) antifreeze/coolants. Nitrited Organic Acid TechnologyĮxtended Life Coolant (ELC) does not require a supplement (referred to as an extender) until 300,000 miles or 6,000 engine hours to achieve the full 600,000 miles or 12,000 engine hours of service life. These formulations are not compatible with the extended interval coolant formulation of either NOAT or OAT coolants and should not be mixed with them. HOAT coolants are most commonly found dyed yellow or orange. Unlike the OAT and NOAT Extended Life Coolants (ELC), HOAT coolants, like the IAT coolants, typically require SCA added back into the system at the first maintenance interval (25,000 miles) or as specified by the engine manufacturer. Hybrid Organic Acid Technology (HOAT), which is a combination of some of the inhibitors used in inorganic IAT and organic OAT coolants, is typically based on a low-silicate, nitrite technology. However, compared to OAT and NOAT coolant formulations, the IAT coolants do require the frequent addition of SCA at an interval of 25,000 miles, or as specified by the engine manufacturer. Today, most of the “conventional low-silicate” antifreeze/coolants in the market are fully formulated with a pre-charge of SCA to protect the cooling systems of heavy duty engines against corrosion, cavitation, liner pitting, freezing and boil over. It was typical to start with a low silicate-based product design for cars and light-duty trucks, which required dilution with water, then you needed to “pre-charge” it with specific amounts of supplemental coolant additives (SCAs) to protect heavy duty engine cylinder liners from destructive pitting corrosion. The original, green-dyed antifreeze/coolants are called conventional low-silicate, but the technical name for this type of coolant and its inhibitor package is Inorganic Acid Technology (IAT).
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