Four problems related to engine oil leaking have been reported for the 2006 BMW 330. The most recently reported issues are listed below.
BMW 3 series models 330i and 325i year 2006/2007 have a problem with valve cover and head bolts breaking off (bolts are made of aluminum), in my personal case, I was inspect my car when I was parked and I found a head bolt close to the oil filter housing broke off and also found the head of the bolt on the engine bay, close to the hole where the oil is being leaking. The leak is bad and I have to fill it up every week. Some other people have had valve cover bolts broken off and oil leaking on the exhaust wich could cause fire and accidents. Seems like this was a factory defect over torquing the bolts or low quality aluminum bolts. BMW should fix this problem with all this models and years. I have read online of several people dealing with this problem an even paying BMW dealers lots of money when the problem begun at the manufacturing plant. Serious engine damaged can occur too if other bolts inside the valve cover break and mess others components up inside the engine. Other newer models don't have this problem after the bolts being upgrade to a better quality aluminum or change the torque value on them. Thanks so much for researching and your time.
A bolt broke on the valve cover. It's not from cold weather or lack of maintenance, it's clearly a manufacturer default. When advised by valley BMW in modesto I learned this happens in most of these models that year. It's from over torquing the bolt or a faulty bolt or something else but it's clearly not the fault of the consumer. Mine broke on the passenger side and it causes the oil to leak on the the exhaust. This is a safety issue and must be addressed immediately. . Read more...
The contact owns a 2006 BMW 330i. The contact stated that fuel was leaking from the oil filter housing. The vehicle was taken to an independent mechanic. The technician diagnosed that the ball cover gasket needed to be replaced. The vehicle was not repaired. The manufacturer was notified of the failure. The approximate failure mileage was 87,243.
One of my valve cover bolts broke causing the oil to leak everywhere.