2.5 LITER. Oil cooler washer. A flat disc with a hole in the center that is placed under or between the Engine Oil Cooler or related components to even out pressure as they are tightened. Engine Oil Cooler O-Ring. Gasket For Oil Cooler. Oil Cooler Drain Bolt. To 11/2020. Engine Gasket. Relief valve o -. Included with: Oil Cooler, Oil Cooler assembly.