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:
Third generation
The 2007 Navigator was unveiled at the Chicago Auto Show in February 2006. It
is joined by a long wheelbase Navigator L based on the Expedition EL and shares
the new Ford T1 platform with that veh ...
Going & Stopping
The MKX's drivetrain is another high point, with a 3.5-liter V-6 generating
265 horsepower at 6,250 rpm and 250 pounds-feet of torque at 4,500 rpm. The
transmission is a six-speed automatic develo ...
SENSE AND STYLE
Family Friendly (Not Really, Fair, Great, Excellent): Greatish
Fun-Factor (None, Some, Good Times, Groove-On): Good Times ...
