If you drive regularly, chances are you know that it’s important to check your engine’s oil and have it changed out regularly. It’s just as true for small cars as it is for heavy-duty trucks or high-powered racers. But why, though? Why is oil so important that we have to constantly keep tabs on it and spend an afternoon killing time in a garage waiting room every 3,000 to 10,000 miles (or when the dashboard indicator comes on)? Is it
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