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Message: <blockquote data-quote="pussy" data-source="post: 611872" data-attributes="member: 60">quite simple guys, usually when the car is left alone for a week or less, the oil seals in the engine shrinks, due to no heat, expansion/retraction. so what happens, is the spark plug top valve gasket will shrink and oil will drip down to the plug well and sits there. when you start the car, oil will cause spark leak into the head, hence the misfiring, even water condensation gets in. Very common in all bmws. dun know about the N54 engines (335i)when this happens, just change the valve cover gasket with the spark plug grommets gasket too.. For the V8 buddiesi had bigger problem on my e32, since the V shape angle, water gets in every time it rains. did a check that water over flowing from the windscreen bottom gutter, drips onto my V8 manifold cover, then drips down inside to the valve cover, which in turn water slips into the spark plug well. Problem, was a missing manifold side gasket. another problem, this gasket Not sold as a single piece, but as a whole cover $$$.solution : put a neoprene rubber, not too bad.</blockquote>