Fall Winterization Checklist

Start winterization in September or October, before the first cold snap. Anti-gel treatment should begin when overnight temperatures drop below 40°F regularly. Air dryer service, battery testing, and heater checks should be completed by October 31 in northern states.

Diesel fuel contains paraffin wax that crystallizes (gels) in cold temperatures, clogging fuel filters and preventing the engine from running. Prevention: use anti-gel additive in every tank when temperatures drop below 20°F, keep fuel tanks above half full (less air means less condensation), and use winter-blend diesel when available.

If you operate in states with chain laws (California, Oregon, Washington, Colorado, Wyoming, and others), yes — chains are mandatory equipment and you can be fined for not carrying them. Even in states without chain laws, chains can save your life on icy mountain grades. Carry them from October through April.