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A mildly redesigned 300 was introduced in 2011 as a four-door notchback sedan, the five-door station wagon version of the 300 having been retired.

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Rear exhaust dust on rear bumper & rear trunk lid?

What may be the cause?

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Have you had your muffler looked at?

When was the last time you had a smog check?

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my camera goes in and out... no i will check that

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Usually if there's soot on the bumper, then something is coming out of the exhaust that shouldn't be. If the exhaust smoke is blue, that's an indication of burning oil; if it's black, then it's running rich.

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How many miles on the car? Any recent work?

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George Harak will be eternally grateful.
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