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MaintenanceOnly use oils certified for gasoline enginesby the American Petroleum Institute (API).An oil with this trademark symbolconforms to the current engine andemission system protection standards andfuel economy requirements of theInternational Lubricants SpecificationAdvisory Council (ILSAC), comprised ofU.S. and Japanese automobilemanufacturers.1. Check the engine oil level.2. If the engine oil level is not within thenormal range, add engine oil thatmeets Ford specifications. SeeCapacities and Specifications (page296).3. Remove the engine oil filler cap anduse a funnel to pour the engine oil intothe opening.4. Recheck the engine oil level. Make surethe oil level is not above the normaloperating range on the engine oil leveldipstick.5. Install the engine oil level dipstick andensure it is fully seated.6. Fully install the engine oil filler cap byturning the filler cap clockwise untilthree clicks are heard or until the capis fully seated.ENGINE COOLANT CHECKWARNINGSDo not add engine coolant when theengine is hot. Steam and scaldingliquids released from a hot coolingsystem can burn you badly. Also, spillingcoolant on hot engine parts can burn you.Do not put engine coolant in thewindshield washer fluid container. Ifsprayed on the windshield, enginecoolant could make it difficult to seethrough the windshield.WARNINGSTo reduce the risk of personal injury,make sure the engine is cool beforeunscrewing the coolant pressurerelief cap. The cooling system is underpressure. steam and hot liquid can comeout forcefully when you loosen the capslightly.Do not add coolant further than theMAX mark.Checking the Engine CoolantWhen the engine is cold, check theconcentration and level of the enginecoolant at the intervals listed in thescheduled maintenance information. SeeScheduled Maintenance (page 438).Note: Make sure that the coolant level isbetween the MIN and MAX marks on thecoolant reservoir.Note: Coolant expands when it is hot. Thelevel may extend beyond the MAX mark.Note: If the level is at the MIN mark, belowthe MIN mark, or empty, add coolantimmediately. See Adding Engine Coolantin this chapter.Maintain coolant concentration within48% to 50%, which equates to a freezepoint between -30°F (-34°C) and -34°F(-37°C).Note: For best results, coolantconcentration should be tested with arefractometer such as Rotunda tool300-ROB75240 available from yourauthorized dealer. Ford does notrecommend the use of hydrometers orcoolant test strips for measuring coolantconcentrations.Note: Automotive fluids are notinterchangeable. Do not use engine coolant,antifreeze or windshield washer fluid outsideof its specified function and vehicle location.241F150 (TF6) , enUSA