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That does sound strange doesn't it? The valve cover gasket, oil cap gasket and rubber grommet on the dipstick would all be stopping crank case pressure from escaping wouldn't they? The article mentions how the crank case pressure is regulated by the PCV valve but it doesn't specify the relationship between crank case pressure and vacuum pressure which is created in the throttle body. I would have thought that these systems are kept separate - but as I'm a newbie to these petrol Mercedes engines I await the advice of others...
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