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      04-18-2012, 08:31 PM   #2
queensfield
First Lieutenant
United_States
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Drives: 2006 330i E90
Join Date: Aug 2011
Location: So Cal

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My guess is increased pressure in the engine area may lead to valve cover gasket leak. One possible cause could be clogged PCV valve and/or hose. Ask them to check it and you are right in finding out the root cause of valve cover gasker leak. However, the diagnosis you posted above also points to valvetronic motor seal as a possibility too.