Ford 1996 Windstar Manual page 360

Exhaust leaks may result in the entry of harmful and
potentially lethal fumes into the passenger compartment.
Under extreme conditions excessive exhaust temperatures
could damage the fuel system, the interior floor covering,
or other vehicle components, possibly causing a fire.
The Scheduled Maintenance Services listed in the Maintenance
Schedule and Record booklet are required because they are
considered essential to the life and performance of your vehicle
and to its emissions system.
Watch for fluid leaks, strange odors, smoke and loss of oil
pressure. Also watch for the charge warning light, the check
engine light, or the temperature warning light. These sometimes
indicate that the emission system is not working properly.
Do not make any unauthorized changes to your vehicle or
engine. Changes that cause more unburned fuel to reach the
exhaust system can increase the temperature of the engine or
exhaust system.
By law, anyone who manufactures, repairs, services, sells, leases
vehicles, trades vehicles, or supervises a fleet of vehicles is not
permitted to intentionally remove an emission control device or
prevent it from working. In some of the United States and in
Canada, vehicle owners may be liable if their emission control
device is removed or is prevented from working.
In general, maintenance, replacement, or service of the emission
control devices or systems in your new Ford Motor Company
vehicle or engine may be performed at your expense by any
automotive repair establishment or individual using automotive
parts equivalent to those with which your vehicle or engine was
originally equipped.
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RWARNING