Oil Coolers - Air or Water?

Air to oil cooling is compared to water to oil cooling, covering various conditions to be considered in the design of a cooler. The following subjects are discussed: minimum oil temperature possible, oil temperature effect on surface required, comparison of surface required with air or water cooling, system pressures, pressure drop, agitation of oil to increase cooler efficiency, and cleanability of each type. Two simple rules are given for obtaining maximum cooling from available space.