1998 Pontiac Firebird Owner's Manual - Page 281

A 50/50 mixture of water and DEX-COOL@ coolant will: 0 0 What to Use Use a mixture of one-half clean water (preferably distilled) and one-halfDEX-COOL@coolant which won't damage aluminum parts. If you use this mixture, you don't needto add anything else. G v freezing protection downto -34°F (-37°C). ie Give boiling protection up to265 "F(1 29°C). Protect against rust and corrosion. Help keep the proper engine temperature. Let the warning lights and gages work as they should. I A CAUTION: Adding only plain water to your cooling system or can be dangerous. Plain water, some other liquid likealcohol, can boil before the proper coolant mixturewill. Your vehicle's coolant warning system is set the proper coolant for mixture. With plain water the wrong mixture, or your engine could get too hot you wouldn't but get the overheat warning. Your engine could catch fire and you or others could beburned. Use a 50/50 mixture of clean waterand DEX-COOL@coolant. NOTICE: When adding coolant, is important that you it use onlyDEX-COOL@(silicate-free) coolant. If coolant other than DEX-COOL is added to the system, premature engine, heater core or radiator corrosion may result. In addition, the engine coolant require change sooner at will 30,000 miles (50 000 km)or 24 months, whichever occurs first. Damage caused the by use of coolant other than DEX-COOL@ not is covered by your new vehicle warranty. -- 6-28