![]() To meet these varied applications, Prestone, as do most antifreeze suppliers, offers a full range of coolants under its Command brand.” “Each of the technologies has its strengths and weaknesses which one is best often will depend on vehicle mix, vehicle application, usage, and maintenance practices. “Each of these formulations-IAT, NOAT, and nitrite-free organic-acid technology coolants, or NF OATs-works exceeding well in the applications for which they’re recommended,” says Colin Dilley, Ph.D., vice president technology, Prestone. A nitrite-containing OAT often is identified as a NOAT. Notable among the ELC OAT hybrids are those containing the inorganic additive of nitrite, which has a proven track record in IAT formulations for deterring liner pitting by creating a tough oxide patina on the liner exterior. A generally accepted third category-known as hybrids, hybrid OATs, or HOATs- includes formulations based on OAT chemistry, but containing one or more inorganic additives to enhance particular performance characteristics. ![]() Frank Cook, Old World Industriesĭiesel antifreeze is classified into two basic categories that have distinctly different additive chemistries: inorganic additive technology (IAT) and organic acid (or additive) technology (OAT), the latter usually identified as extended-life coolant, or ELC. "Extended-life types continue to gain ground on fully formulated coolant.” -Dr. Formulations differ by virtue of their additive chemistry, but all diesel-antifreeze additive packages have the same basic tasks-to deter such culprits as rust, scale, corrosion, aeration, acids, and the process of cavitation/erosion/corrosion, which can pit the outside surface of a diesel’s wet cylinder liners (sleeves)-or even perforate liners if the process is left unchecked. Virtually all concentrated heavy-duty antifreeze is roughly 95 percent ethylene glycol (or propylene glycol, which is somewhat less toxic) and 5 percent additives and water. ![]() Considering this range of knowledge, we offer a quick refresher. In talking with a variety of machine and vocational-truck owners who work in the “real” world, Construction Equipment is aware that knowledge of diesel-engine coolant (ideally, a 50/50 mix of antifreeze and distilled/deionized water) varies from those who have no idea what’s in the radiator of their backhoe, to fleet managers who can discuss specific additives used in a particular antifreeze formulation. But this is not an ideal world.”-Stede Granger, P.E., OEM technical services manager, Shell Global Solutions (U.S). 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.”In an ideal world, in which no one ever touched the coolant and the vehicle never leaked, a high-quality extended-life coolant would be virtually maintenance-free. 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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