How long before changing engine coolant?
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The best answer is to read the Maintenance section of your owner’s manual for the answer. They will usually list a mileage and time for change. The more general answer is; if you are using the old coolant formulation (usually green) that contains Silicates as the the anti-corrosive technology, you should not leave it in longer than 4 years. If you are using the newer Organic Acid Technology (OAT) coolants (usually orange or red), they are truly good for a 10-year stint.
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