When to plug in diesel truck for easy winter starts

If you're staring out the window at a frost-covered driveway, you're probably wondering exactly when to plug in diesel truck units to make sure they actually fire up in the morning. There is nothing quite as gut-wrenching as turning the key and hearing that slow, labored whir-whir-thud of a frozen engine that just isn't ready to wake up. While every truck has its own personality, most experienced owners agree that when the thermometer dips below 20°F (-7°C), it's time to start thinking about that extension cord. ...

May 14, 2026 · 7 min · Federico Mylan