Pontiac 2009 G8 Owner's Manual page 220

9-16 Vehicle Service and Care
What to Use
{
CAUTION
Adding only plain water to the
cooling system can be dangerous.
Plain water, or some other liquid
such as alcohol, can boil before
the proper coolant mixture will.
The vehicle's coolant warning
system is set for the proper
coolant mixture. With plain water
or the wrong mixture, the engine
could get too hot but you would
not get the overheat warning. The
engine could catch fire and you or
others could be burned. Use a
50/50 mixture of clean, drinkable
water and DEX-COOL
Use a 50/50 mixture of clean,
drinkable water and DEX-COOL
coolant. If using this mixture,
nothing else needs to be added.
This mixture:
•
Gives freezing protection down
to 34°F ( 37°C), outside
temperature.
•
Gives boiling protection up to
265°F (129°C), engine
temperature.
•
Protects against rust and
corrosion.
•
Will not damage aluminum parts.
•
Helps keep the proper engine
temperature.
®
coolant.
Notice: If an improper coolant
®
mixture is used, the engine could
overheat and be badly damaged.
The repair cost would not be
covered by the vehicle warranty.
Too much water in the mixture
can freeze and crack the engine,
radiator, heater core, and
other parts.
Notice: If extra inhibitors and/or
additives are used in the vehicle's
cooling system, the vehicle
could be damaged. Use only the
proper mixture of the engine
coolant listed in this manual
for the cooling system. See
Recommended Fluids and
Lubricants on page 11-12 for
more information.