Ford 1996 Crown Victoria Manual page 268

Ford Premium Cooling System Fluid is an
optimized formula that will protect all metals
and rubber elastomers used in Ford engines for
four years or 50,000 miles (80,000 km). It is not
necessary and not recommended to use
supplemental coolant additives in your gasoline
powered vehicle. These additives may harm
your engine cooling system. Follow the
recommended service interval for changing your
engine coolant.
NOTE: When you change or add engine
coolant, it is important to maintain
your engine coolant concentration
between 40% (-11˚F [-24˚C]) and 60%
(-62˚F [-52˚C]), depending on your local
climate conditions. Below 40% you will
lose freeze protection and above 60%
your engine may overheat on a warm
day.
NOTE: The use of an improper coolant may
void your warranty for the engine
cooling system. Use only a premium
nationally recognized brand name
engine coolant. Do not use alcohol,
methanol antifreeze or engine coolant
mixed with alcohol or methanol
antifreeze. If you do not use the proper
coolant, the aluminum radiator on your
vehicle will corrode.
Ford Motor Company expressly authorizes the
Ford Rotunda engine coolant recycling process
and chemicals. Use only Ford Rotunda recycled
engine coolant or an equivalent recycled engine
coolant that is certified by the supplier to meet
Ford specification ESE-M97B44-A.
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