when i worked at bill heard, a lady in a ecotec cavalier came in for an oil change(of course she was black). She hadnt had an oil change in about 22000 miles, she had tons of nails in her tires, and she had about 6 tire plugs in the sidewall of her front left tire. We took the valve cover off the car and the sludge had molded itself to the bottom of the valve cover. It looked like a brown valve cover. The motor was unsavable and she later traded it in for another cavalier....