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The 2004 Mercedes Benz C320 experiences problems with a faulty oxygen sensor and excessive oil consumption. It is crucial to replace the oil regularly every 5,000 to 10,000 miles to prevent engine issues. Using high-quality oil is essential for optimal engine performance. Neglecting to change the oil can lead to engine failure, indicated by a burning smell and reduced gas mileage. If the oil is not replaced promptly, it could result in a dangerous situation such as engine knocking or even potential vehicle combustion.
Issues with the 2004 Mercedes Benz C320 have been reported including stalling and "crank no start" due to a malfunctioning crankshaft position sensor, a drained battery caused by a faulty seat control module, and a ticking noise from behind the dashboard possibly due to a broken stepper motor actuating arm.