Is there a PCV valve in w210?
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'99 E430, '05 ML500, '15 GLK350
No valves, but each valve cover has a vent on top with a tube, running to the intake in the rear, connected to it. The hole to the tube is actually a pinhole and can clog from sludge over time. Also, the tubes harden with age and should be replaced (mine at about 10 years).