System Specifications

ENGINE OIL SPECIFICATIONS






To help achieve proper engine performance and durability, it is important that only engine lubricating oils of the proper quality are used in your diesel engine and that the engine oil is changed no later than the recommended interval. Diesel engines require specially formulated oil to resist contamination. Proper quality oils also provide maximum efficiency of the crankcase ventilating system which reduces air pollution.

For normal or severe service, use Motorcraft oil or an equivalent oil conforming to Ford Specification WSS-M2C171D or API Service categories CI-4, CI-4/SL or DHD-1. If CI-4 oil is not available, CH-4 is acceptable.

Engine oils with improved fuel economy properties (energy conserving) are currently available. If you use an energy conserving oil, be sure it meets the recommended Ford Specification, API service categories and SAE viscosity grades. Some energy conserving oils do not meet the requirements necessary for your diesel engine. * Heavy duty trailer towing with ambient temperatures above 50°F (10°C) requires 15W-40 engine oil. The use of correct oil viscosities for diesel engines is important for satisfactory operation. Determine which oil viscosity best suits the temperature range you expect to encounter for the next service interval.