i have A LOT OF AIR COMING out of the oil fill cap when it is removed with engine idling . it is clear air , engine has no oil smoke blowby nor does it smoke out exhaust pipe and uses no oil between changes. with engine running and oil cap removed if i put my hand over the hole it gets oil soaked in seconds . is this normal ? i also have to clean the mass air flow sensor about every 3000 to 4000 miles. what is the problem? thanks, mike

Bad PCV valve & also possible blockage in oil seperator..MB issued bulletin on problem back in 2000.

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