Winterizing for Diesel

Weak batteries often die once the cold sets in. O'Reilly Auto Parts will test your battery and alternator for free.
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Anti-gel diesel fuel additives can help keep your diesel fuels from gelling. There are also additives available for emergencies when your engine won't start because of iced or gelled fuel.
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Consider using a lighter-weight engine oil during winter. Preferably synthetic oil. Conventional, heavier-weight oils thicken up in cold temperatures which can affect its ability to flow.
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If your vehicle isn't equipped with one, it's a good idea to invest. Especially if you live in an environment that gets sub-zero temperatures. If you have a block heater, it's a good idea to test it with a multi-meter to make sure it's functional.
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Changing your fuel filter or filters before winter doesn't guarantee you won't get frozen fuel there, but starting winter with clean filters and draining the water separator helps minimize the risk.
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Since glow plugs are designed to help with cold starts, it's important to have proper functioning glow plugs ahead of the winter months.
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