2008 Mercury Grand Marquis Owner Guide 1st Printing - Page 260

Maintenance and Specifications Correct fluid level The transmission fluid should be checked at normal operating temperature 150°F-170°F (66°C-77°C) on a level surface. The normal operating temperature can be reached after approximately 20 miles (30 km) of driving. You can check the fluid without driving if the ambient temperature is above 50°F (10°C). However, if fluid is added at this time, an overfill condition could result when the vehicle reaches normal operating temperature. The transmission fluid should be in this range if at normal operating temperature (150°F-170°F [66°C-77°C]). The transmission fluid should be in this range if at ambient temperature (50°F-95°F [10°C-35°C]). High fluid level Fluid levels above the safe range may result in transmission failure. An overfill condition of transmission fluid may cause shift and/or engagement concerns and/or possible damage. High fluid levels can be caused by an overheating condition. Adjusting automatic transmission fluid levels Before adding any fluid, make sure the correct type is used. The type of fluid used is normally indicated on the dipstick. Refer to Maintenance product specifications and capacities in this chapter. Use of a non-approved automatic transmission fluid may cause internal transmission component damage. If necessary, add fluid in 1/2 pint (250 ml) increments through the filler tube until the level is correct. 260 2008 Grand Marquis (grn) Owners Guide (post-2002-fmt) USA (fus)