6. Wipe the indicator clean. Insert the indicator fully, then remove it
again.
• If the oil level is between the MIN and MAX marks, the oil level is
acceptable. DO NOT ADD OIL.
• If the oil level is below the MIN
mark, add enough oil to raise the
level within the MIN-MAX range.
• Oil levels above the MAX mark may cause engine damage. Some oil
must be removed from the engine by a service technician.
7. Put the indicator back in and ensure it is fully seated.
Adding engine oil
1. Check the engine oil. For instructions, refer to Checking the engine
oil in this chapter.
2. If the engine oil level is not within the normal range, add only certified
engine oil of the recommended viscosity. 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
MAX mark on the engine oil level indicator (dipstick).
4. Install the indicator and ensure it is fully seated.
5. Fully install the engine oil filler cap by turning the filler cap clockwise
1/4 of a turn or until the cap is fully seated.
To avoid possible oil loss, DO NOT operate the vehicle with the
engine oil level indicator and/or the engine oil filler cap removed.
2005 F250/350/450/550 (f23)
Owners Guide (post-2002-fmt)
USA_English (fus) Maintenance and Specifications
253
