Motorcraft® Engine Cooling System Products and Engine Coolants

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Green OR gold, not both.

Do not mix different colors or types of coolant in your vehicle. Make sure the correct coolant is used. Mixing of engine coolants may harm your engine’s cooling system. The use of an improper coolant may harm engine and cooling system components and may void the warranty.

http://www.fordparts.com/Products/Chemicals-EngineProducts-Coolants.aspx