2008 Chrysler PT Cruiser Owner Manual - Page 402

400 MAINTAINING YOUR VEHICLE Adding Coolant Your vehicle has been built with an improved engine coolant that allows extended maintenance intervals. This coolant can be used up to five Years or 100,000 miles before replacement. To prevent reducing this extended maintenance period, it is important that you use the same coolant throughout the life of your vehicle. Please review these recommendations for using Hybrid Organic Additive Technology (HOAT) coolant. When adding coolant: • The manufacturer recommends using Mopar௡ Antifreeze/Coolant five Year/100,000 Mile Formula HOAT (Hybrid Organic Additive Technology). • Mix a minimum solution of 50% HOAT engine coolant and distilled water. Use higher concentrations (not to exceed 70%) if temperatures below Ϫ34° F (Ϫ37° C) are anticipated. • Use only high purity water such as distilled or deionized water when mixing the water/engine coolant solution. The use of lower quality water will reduce the amount of corrosion protection in the engine cooling system. Please note that it is the owner's responsibility to maintain the proper level of protection against freezing according to the temperatures occurring in the area where the vehicle is operated. NOTE: Mixing coolant types will decrease the life of the engine coolant and will require more frequent coolant changes. Cooling System Pressure Cap The cap must be fully tightened to prevent loss of coolant, and to insure that coolant will return to the radiator from the coolant recovery bottle.