Ford Super Duty Owner's Manual page 315

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Low Fluid Level

Do not drive the vehicle if there is no indication of fluid on the dipstick

and the ambient temperature is above 50°F (10°C).

Correct Fluid Level

For vehicles equipped with 5-speed transmissions, the fluid should be

checked at normal operating temperature 150°F-170°F (66°C-77°C) on

a level surface. For vehicles equipped with 6-speed transmissions, the

fluid should be checked at normal operating temperature 196°F-216°F

(91°C-102°C) on a level surface. The normal operating temperature

can be reached after approximately 20 miles (30 km) of driving.

2013 F-250/350/450/550 (f23)

Owners Guide gf, 3rd Printing, December 2012