1999 Ford F350 7.3L Diesel Supplement 1st Printing - Page 25

General maintenance information Engine lubrication for severe service operation The following severe service operating conditions require unique engine maintenance procedures: • towing a trailer over 1 600 km (1 000 miles) • sustained, high speed driving at Gross Vehicle Weight Rating (maximum loaded weight for vehicle operation during hot weather-above 32°C [90°F]). • frequent or extended idling (over 10 minutes per hour of normal driving). • operating in severe dust conditions. • frequent, short trips of 16 km (10 miles) or less during freezing weather If you are operating your vehicle under any of these conditions, observe the following service procedures: • Change engine oil and filter every 5 000 km (3 000 miles). • Use Motorcraft oil or an equivalent oil conforming to Ford Specification ESR-M2C171-C or API categories CG-4/SH. Do not use oils labeled with only one of the following category designations, SG, SH, CE, CF-4 or CG-4, as they could cause engine damage. For more information refer the Severe Duty Maintenance Schedule in the "Service Guide". REPLACING AIR CLEANER When replacing the air cleaner, use a Motorcraft filter or its equivalent. Refer to Lubricant and Maintenance Materials Specifications in this supplement. Failure to use the correct filter may result in severe engine damage when driving through deep water and/or encountering unusually heavy precipitation conditions. 1. Remove air cleaner, taking care to prevent dirt from falling into the engine air intake. 2. Clean the air cleaner tray and cover to ensure good sealing. 25