2013 Ford F350 Super Duty Super Cab Owner Manual Printing 3 - Page 308

Maintenance 307 Adding Engine Oil Note: Do not remove the engine oil level dipstick or the filler cap when the engine is running. Note: Do not add engine oil further than the MAX mark. Oil levels above the MAX mark may cause engine damage. Only use oils certified for gasoline engines by the American Petroleum Institute (API). An oil with this trademark symbol conforms to the current engine and emission system protection standards and fuel economy requirements of the International Lubricants Specification Advisory Council (ILSAC), comprised of U.S. and Japanese automobile manufacturers. 1. Check the engine oil level. 2. If the engine oil level is not within the normal range, add engine oil that meets Ford specifications. See Capacities and Specifications for more information. Remove the engine oil filler cap and use a funnel to pour the engine oil into the opening. 3. Recheck the engine oil level. Make sure the oil level is not above the normal operating range on the engine oil level dipstick. 4. Install the dipstick and ensure it is fully seated. 5. Fully install the engine oil filler cap by turning the filler cap clockwise until three clicks are heard or until the cap is fully seated. ENGINE COOLANT CHECK Checking the Engine Coolant The concentration and level of engine coolant should be checked at the intervals listed in scheduled maintenance information. The coolant concentration should be maintained within 48% to 50%, which equates to a freeze point between -30°F (-34°C) and -34°F (-37°C). Note: For best results, coolant concentration should be tested with a refractometer such as Rotunda tool 300-ROB75240 available from your dealer. Ford does not recommend the use of hydrometers or coolant test strips for measuring coolant concentrations. Note: Make sure that the level is between the MIN and MAX marks on the coolant reservoir. 2013 F-250/350/450/550 (f23) Owners Guide gf, 3rd Printing, December 2012 USA (fus)