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In the 2018 Ford Focus, the recommended coolant is a 50/50 mix of dex-cool. To change the coolant, start by locating the radiator under the hood, which is positioned in front of the engine and has a clear or black plastic reservoir attached. This reservoir includes a drain plug, fill plug, and a dipstick for measuring coolant levels. If you only need to top off the coolant, measure the amount in the reservoir and add more as needed. For a complete flush, open the drain plug to release the old coolant into a container, and you can use water to assist in the flushing process. Once the drained coolant runs clear, close the drain plug, refill the reservoir to the recommended level indicated by the dipstick, and replace the cap securely.
The recommended coolant for the 2018 Ford Focus is a mixture that is half Dex-Cool.