Ford Mustang Owner's Manual page 181

Maintenance and Specifications
• NEVER increase the coolant concentration
above 60%.
• Increased engine coolant concentrations
above 60% will decrease the overheat
protection characteristics of the engine
coolant and may cause engine damage.
• Refer to the chart on the coolant container
to ensure the coolant concentration in your
vehicle will provide adequate freeze
protection at the temperatures in which you
drive in the winter months.
If you drive in extremely hot climates:
• It is still necessary to maintain the coolant
concentration above 40%.
• NEVER decrease the coolant concentration
below 40%.
• Decreased engine coolant concentrations
below 40% will decrease the corrosion
protection characteristics of the engine
coolant and may cause engine damage.
• Decreased engine coolant concentrations
below 40% will decrease the freeze
protection characteristics of the engine
coolant and may cause engine damage.
• Refer to the chart on the coolant container
to ensure the coolant concentration in your
vehicle will provide adequate protection at
the temperatures in which you drive.
Vehicles driven year-round in non-extreme climates
should use a 50/50 mixture of engine coolant and
distilled water for optimum cooling system and
engine protection.
2004 Mustang (mus)
Owners Guide (post-2002-fmt)
USA English (fus)
181