Most diesel owners think about fuel additives when the weather gets cold. Winter fuel problems are obvious: fuel can gel, filters can plug, and engines can struggle to start. But warm weather creates its own diesel fuel problems. They are usually quieter and build gradually. By the time you notice them, they may already be costing you fuel economy, throttle response, engine performance, and long-term fuel system protection. Hot weather, long-haul driving, heavy towing, agricultural work, extended idle time, and increased equipment usage all place extra demand on a diesel fuel system. During the summer, your engine may be running longer, working harder, and burning more fuel than it does during any other season. That raises an important question: do diesel engines need fuel additives in the summer?
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