The Acura MDX Oil Cooler maintains oil temperature in the engine to the point where the oil viscosity remains steady and heat does not damage the parts. In every generation of the MDX, this Oil Cooler functions by taking hot lubricant and pumping it through a compact oil-to-water heat exchanger that shares coolant with the radiator. This allows oil to heat up quickly during startups but limits peak heat under load. Early versions of the MDX were based on the same basic layout of the exchanger applied in today's models, and the updated update by Acura still maintains the same tried and proven setup. The primary change is in better materials rather than a change in the style of Oil Cooler. Across MDX model years, Acura had a primary focus on developing the build quality of the exchanger to preserve the important Acura powertrains. While effective for driving on a daily basis, hard towing or steep grades can run temperatures high enough that even the factory Oil Cooler approaches its limits, especially if coolant passages are clogged from neglect of antifreeze service. Should the walls of the exchanger be penetrated by corrosion, coolant can mix with oil, potentially causing damage to the engine and indicating the need for immediate Oil Cooler replacement.
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