1999 Ford F350 7.3L Diesel Supplement 1st Printing - Page 24

General maintenance information A symbol has been developed by the VICE CG American Petroleum Institute (API) ER to help you select the proper engine SAE 15W-40 oil. It will be included on the oil container you purchase. The top section of the symbol shows the oil performance by the API designation. This should match the owner guide recommendation. The center section will show the SAE viscosity grade. The lower section will state energy conserving if the oil has proven fuel saving capabilities. API S Changing engine oil and filter Change your oil and filter according to the "Service Guide". Change more frequently if your vehicle operation includes extended periods of idling or low-speed operation, driving for a long time in cold temperatures or driving short distances. See the following section "Engine Lubrication for Severe Service Operation" for all severe duty restrictions. Use Ford Engine Oil Filter Part No. F4TZ-6731-A (FL-1995) or equivalent. These filters protect your engine by filtering harmful, abrasive or sludge particles. The FL-1995 filters particles significantly smaller than most available "will fit" filters. To replace, use an oil filter wrench to unscrew the filter from the oil cooler fitting. Turn it horizontally to let excess oil drain off, and remove. Do not handle a hot oil filter with bare hands. Clean the filter mounting area on the oil cooler, lightly coat the gasket surface of the new filter with clean engine oil and hand tighten until the gasket contacts the base. Then tighten another 1-1/4 to 2 turns. Fill the crankcase and run the engine to check for leaks. Continuous contact with USED motor oil has caused cancer in laboratory mice. Protect your skin by washing with soap and water. /SH -4 24