Reaking-in your vehicle
Your vehicle does not need an extensive break-in. Try not to drive continuously at the same speed for the first 1,000 miles (1,600 km) of new vehicle operation. Vary your speed frequently in order to give the moving parts a chance to break in.
Drive your new vehicle at least 1,000 miles (1,600 km) before towing a trailer. For more detailed information about towing a trailer, refer to Trailer towing in the Tires, Wheels and Loading chapter.
Do not add friction modifier compounds or special break-in oils since these additives may prevent piston ring seating. See Engine oil in the Maintenance and Specifications chapter for more information on oil usage.
See also:
Engine block heater (if equipped)
WARNING: Failure to follow engine block heater instructions
could result in property damage or physical injury.
WARNING: To reduce the risk of electrical shock, do not use
your heater with ungrou ...
Performance
A big SUV is all about imposing looks and a muscular engine. The Navigator
has the looks part down, but the 300-horsepower V-8 engine seems woefully
lacking in the power department, especially at ...
Underbody
Flush the complete underside of your vehicle frequently. Keep body and
door drain holes free from packed dirt. ...