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If the DEF is stored in a cool dry location and away from direct sunlight, it will last a long time.
Running two large Ag tractors and one diesel truck that use DEF and have never had problems.
Sometimes we get hung up on expiry dates, My tractors don't move over the winter months where temps can reach minus 40F. They still operate fine in the spring. Many large farmers buy it by the large drum 210 litres with no problems about age of product.
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