Extended-Life Coolant (ELC)
Extended-life coolants are coolants that use advanced organic acid technology (OAT). These additives deplete at a much slower rate than traditional coolant additives. This slow rate of depletion allows the coolant to protect the engine in a much more efficient manner and provide longer protection compared to conventional coolants. This eliminates the need to add Supplemental Coolant Additives (SCAs), extending coolant service intervals and providing superior heat transfer, cavitation protection, and corrosion protection.
Extended-life coolants should only be used on approved engines, as the organic acids can be incompatible with certain metallic and nonmetallic materials. Some brass compounds and some silicone-based seal materials can be adversely affected by prolonged exposure to extended life coolant, particularly in areas where the material is “scrubbed” by the coolant moving at high speeds inside the engine. So, be sure to check the owner’s manual for compatibility.
What are the benefits of Extended-Life Coolants?
Because the organic acid technology in extended life coolant protects the engine system without use of conventional abrasive corrosion inhibitors such as silicate and phosphate, truck and bus owners will benefit by:
– Avoiding silicate dropout (sometimes called “green goo”), which clogs coolant passageways.
– Reducing water pump seal failures.
– Improving hard water compatibility, reducing hard scale that can deposit.
– Improving maintenance costs. Due to the longer service intervals, fewer labor hours are required and fewer materials need to be purchased.
– Reduce engine operating temperature increasing component life.
– Extend the engine oil’s life by reducing the oxidation rate caused by higher temperatures, This will help increase drain intervals also decreasing maintenance and labor costs for oil changes.
Commercial pre-diluted mixes, such as Chevron DELO Extended Life Coolant, will provide engine protection for up to 750,000 miles in on-road applications, and 15,000 hours, or 8 years in off-road and non-highway use depending on the severity of truck, bus, or equipment usage. You can also increase the benefits of the extended-life coolant further by adding a coolant extender to the cooling system. Doing so will provide an additional 250,000 miles in on-road use and 5,000 hours protection in off-road and non-highway applications. After 1,000,000 miles, 20,000 hours, or eight years, the coolant should be drained, flushed, and refilled.
Are Extended-Life Coolants Compatible with Conventional Coolants?
Although extended-life coolant is compatible with conventional coolant, mixing extended-life coolant with conventional coolant to top off leaks will reduce the benefits of the extended-life coolant. If mixture with conventional coolant exceeds 10%, the coolant must be maintained as a conventional system using SCAs, or should be drained and flushed, then refilled with new extended-life coolant.
– James Blankenbeckler, Commercial Sales & Service Division