Diesel engines power more than you may realize. While diesel was once considered a useless byproduct of the crude oil refinery process, it’s now responsible for powering everything from freight trains, buses, and trucks to military equipment, farming machinery, boat engines, and more. But while diesel fuel can provide surprisingly efficient power, it also comes with at least one downside: the potential to gel. It’s a sticky problem — literally — and it can cause some annoying issues, including
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