I am assuming this is related to the pcv valve/crankcase breather hose, and/or the valve cover gasket. With a leak from #3, you’ll typically find white residue from the coolant spray which happens once it’s pressurized Check around the air box and on your alternator You may also find oil seepage down on your belt tensioner. There's a lot of pics but i was trying to get all the areas where oil appeared to be leaking, and then the area where oil likely leaks on these cars but doesn't appear to be Opg, ofhg, and the rear main seal appear to be good
This leave me with the valve cover. The oil filter housing gasket (ofhg) begins to deteriorate and leak oil as the n55 ages, constituting a further vulnerability In the short term, an ofhg leak is not a significant issue However, to avoid undue alarm, the oil frequently leaks onto the belt tensioner and drive belt. A dealer told me that the 2012 335i n55 has a common problem with an oil leak near the oil filter flange Has any body heard of this problem
