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The 2004 Mercedes C240 faces issues like a dead battery and excessive oil consumption. It's crucial to use top-quality oil for the engine to function smoothly, as bad oil can lead to engine failure. One common sign of trouble is a strong burning odor, which should be addressed promptly to prevent potential damage. An engine knocking noise and decreased gas mileage may also occur. Regular oil changes are necessary, ideally every 5,000 to 10,000 miles to prevent engine problems. Neglecting oil changes can have serious consequences for the engine's performance.
Issues with the engine, electrical system, transmission, brakes, seatbelts, airbags, and suspension have been reported in the 2004 Mercedes C240.