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2012 Mercedes-Benz E-Class Luxury 3.5L 4dr Sedan RWD

2012 Mercedes-Benz E-Class
Trim Info:
Rear Wheel Drive, 4 Door Sedan, Midsize Cars
17 (2011) mpg city / 24 (2011) mpg hwy
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You will need to take this vehicle to a mechanic for analysis and repair. If this engine has adjustable valves, it may only need a minor adjustment. As far as the exhaust manifold is concerned, have the mechanic inspect the exhaust manifold bolts, as they may be loose

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Recommendation:

Loose valves or a leaking exhaust manifold are likely the issue

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