Damage
Periodically inspect the tire treads and sidewalls for damage (such as bulges in the tread or sidewalls, cracks in the tread groove and separation in the tread or sidewall). If damage is observed or suspected have the tire inspected by a tire professional. Tires can be damaged during off-road use, so inspection after off-road use is also recommended.
WARNING: Age
Tires degrade over time depending on many factors such as
weather, storage conditions, and conditions of use (load, speed,
inflation pressure, etc.) the tires experience throughout their lives.
In general, tires should be replaced after six years regardless of tread wear. However, heat caused by hot climates or frequent high loading conditions can accelerate the aging process and may require tires to be replaced more frequently.
You should replace your spare tire when you replace the road tires or after six years due to aging even if it has not been used.
See also:
Fuel quality
If you are experiencing starting, rough idle or hesitation driveability
problems during a cold start, try a different brand of “Regular” unleaded
gasoline.
Do not add aftermarket fuel additive ...
Under the Hood
Lincoln’s 5.4-liter V-8 engine develops 300 horsepower and 355 pounds-feet of
torque, and it mates with a four-speed-automatic transmission. The Navigator is
rated as an Ultra Low Emissions Vehicl ...
Car finder
Press twice within three
seconds. The horn will chirp and the turn
lamps will flash. It is recommended that this method be used to locate
your vehicle, rather than using the panic alarm. ...