Engines run cooler and more efficiently when a thick film of crud doesn’t interfere with heat transfer। This is especially important with modern engines that operate hotter in more compact engine compartments. Clean engines make it easier to see oil, automatic transmission and coolant leaks and monitor the condition of drive belts. Dirt and dust also can cause premature wear of components and belts. And it’s much more pleasant to make repairs in a clean engine compartment. If you need just one more reason to keep your engine spotless, consider that keeping engines free of oil and fuel-soaked gunk goes a long way toward preventing underhood fires.
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