Severe climates

Severe climates  - Engine coolant - Maintenance and Specifications - Lincoln MKS Owners Manual - Lincoln MKS

If you drive in extremely cold climates:

Х It may be necessary to increase the coolant concentration above 50%.
Х NEVER increase the coolant concentration above 60%.
Х A coolant concentration of 60% will provide improved freeze point protection. Increased engine coolant concentrations above 60% will decrease the overheat protection characteristics of the engine coolant and may cause engine damage.
Х If available, 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:

Х It is still necessary to maintain the coolant concentration above 40%.
Х NEVER decrease the coolant concentration below 40%.
Х Decreased engine coolant concentrations below 40% will decrease the corrosion/freeze protection characteristics of the engine coolant and may cause engine damage.
Х If available, 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.

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