I had the same problem with my 2003 Z4 3.0 with 64,000 miles. It would smell so bad that I had to open the windows for a few minutes to clear the smell. This happened about once a day until I replaced the valve cover gasket. This solved the problem right away.AlienZed said:Yep same thing.theres a good vid on utube how to do it .19 mins long a guy called raj and his mate.doin the work.
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Moz