Pontiac 2008 G8 Owner's Manual page 198

9-14 Vehicle Service and Care
What to Use
Use a mixture of one-half clean,
drinkable water and one-half
®
DEX-COOL coolant which will not
damage aluminum parts. If you
use this coolant mixture, you do not
need to add anything else.
{
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.
(Continued)
CAUTION (Continued)
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
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
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.
If you have to add coolant more
than four times a year, have
your dealer/retailer check your
cooling system.
Notice: If you use extra
inhibitors and/or additives in your
vehicle's cooling system, you
could damage your vehicle. 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
coolant.
more information.