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: 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 boilover. 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. Mainstream green coolant: 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). Recent years have seen a number of new inhibitor technologies for these formulations enter the market as heavy duty engine manufacturers have improved the capabilities of their products. Today, inhibited ethylene glycol-along with propylene glycol, a similar, less toxic, odorless, colorless, viscous organic compound-remains the major component of antifreeze/coolant. If the coolant is unable to satisfy the basic requirements, the heavy-duty vehicle’s emissions, fuel economy, horsepower and durability of engine components could be compromised, in addition to the possibility of corrosion, pitting and cavitation. From efficient heat transfer to the control of critical metal temperatures, to providing an increased cooling index and freeze protection, to effective inhibition of corrosion for all cooling-system metals, coolants have evolved to become one of the lifebloods of any heavy-duty engine.
The importance of coolants has become more critical because they provide necessary protection for more sophisticated engines.
HEAVY DUTY GREEN COOLANT MANUAL
Use new coolant if replacing a cooling system part Always refer to vehicle manufacturer or service manual for recommended change intervals, cooling system capacity and specific cooling system service instructions.Improper maintenance of a heavy duty coolant system can create many performance issues for the engine and its components, including cavitation pitting. Add NOAT coolant extender at 300,000 and 600,000 mile and, as necessary, to maintain inhibitor level and pH. When cooling levels drop through normal engine use, top up using this product as necessary and test coolant every 6,000 hours or 1 year-whichever is shorter- using a refractometer to make sure your coolant is adjust to the correct coolant/water mixture and then use test trips to assess nitrite level and pH.
*To achieve 750,000 mile extended service life, adhere to the following steps: perform a cooling system flush and then fill the cooling system with the proper mixture of PURUS® Heavy Duty Extended Life Antifreeze/Coolant and high quality water. PURUS® Heavy Duty Extended Life 50/50 Prediluted Antifreeze/Coolant is a 50/50 blend of antifreeze and demineralized water that provides extended life up to 750,000 mile service life protection* when added to ANY NOAT ELC type heavy duty antifreeze/coolant. Its technologically-advanced formulation and TMC compliant color is based on a concentrated blend of premium long-lasting inhibitors designed to guard against temperature extremes, rust, corrosion, scale, and premature water pump failure. PURUS® Heavy Duty Extended Life 50/50 Prediluted Antifreeze/Coolant is intended for use and compatible with ANY nitrited heavy duty Extended Life (NOAT) antifreeze/coolant in ANY diesel powered truck, farm, off-road, and marine engine with aluminum and other engine metals.
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