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An oil cooler is a heat exchanger that helps regulate the temperature of engine or transmission oil. By dissipating excess heat, it ensures the oil maintains optimal viscosity, which is crucial for effective lubrication and the longevity of engine components.

While a larger oil cooler can provide more cooling capacity, it's essential to match the cooler size to your engine's requirements. An oversized cooler may lead to oil temperatures that are too low, potentially causing increased engine wear due to insufficient oil viscosity. Using a thermostat in the oil cooler system can help maintain the oil within the optimal temperature range.​

A properly installed oil cooler should not significantly affect oil pressure. However, it's crucial to ensure that the cooler and associated lines are appropriately sized and free from obstructions to maintain adequate oil flow and pressure.​