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THE XF six-cylinder had an alloy cylinder head on a cast-iron block, a combination that was prone to corrosion, which makes it important to use a corrosion inhibitor and not just plain water. Ford recommends that 300ml of inhibitor be added to the cooling system every 12,000km, and that the coolant be drained and replaced every 46,000km, at which time you should add 600ml of inhibitor.
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