What Is The Most Common Automotive Misconception?

Like tales passed down by old wives, common car wisdom isn't always the most accurate. Of all those things you've heard about cars over the years, which one stands out? What is the most common automotive misconception?

I have to go with the 3,000-mile oil change, a remnant of past maintenance truth. Common wisdom now indicates most drivers' usage cycles will allow oil a 5,000-10,000 lubrication life. Of course, if you drive only a couple of miles a day, or less than, say, ten grand a year, or live in a desert, the old truth still applies. What others are there?

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