400665 / 400665 - Application Notes Our specially designed Oil Cooler Kit will reduce oil temperatures by circulating hot oil outside the engine through a high-efficiency cooler. The idea is to get the oil from a typical 225°F to an optimal 185°F. By cooling the oil, the life and quality of the oil are improved while thousands of miles of life are added to high-wear engine components such as piston rings, piston skirts, cam bearings, and rod bearings. The Oil Cooler Kit comes complete with all the necessary adapters, fittings, and hoses you will need for installation.