Tier 4 diesel engine technology has changed the way many construction equipment systems run – and that includes engine coolant. Tier 4 engine advances generally create higher combustion temperatures and cylinder pressures. Coolant must resist deposit buildup and other issues that can occur rapidly under these conditions.
As a result, manufacturers have begun shipping Tier 4 Final machines factory filled with Organic Acid Technology (OAT) coolant (a form of extended life coolant, or ELC). By way of example, CASE began shipping select machines with this coolant in December 2013 and will expand it across further product lines through 2016. All CASE Tier 4 Final machines with FPT engines in the ≥ 56 kW emissions category will have OAT coolant when they leave the factory. The factory will phase-in OAT coolant at varying intervals through other emissions categories.