Ford MUSTANG Manual page 114

5. Stand away from the radiator opening. Hot
steam may blow out or hot engine coolant
may even splash out.
To find out how much engine coolant mixture
your vehicle's coolant system can hold, see Refill
capacities for fluids in the Index.
Add engine coolant only to the reservoir. If the
coolant level is low, add a 50/50 or appropriate
mixture of water and the type of engine coolant
that Ford specifies. You may add water by itself
only in an emergency, but you should replace it
with a 50/50 or appropriate mixture as soon as
possible.
Have your dealer check the engine cooling
system for leaks if you have to add more than a
quart (liter) of engine coolant more than once a
month.
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.
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