engine oil leak 2004 3.0 litre a6 quattro
 

burnt oil fumes filling passenger compartment due to oil landing on exhaust manifold due to increased crankcase pressure. This condition is most pronounced in very cold weather (-20 Celsius). If warm up time not allowed for oil leaks from valve cover and or ignition coil seals and burns on exhaust. One possibility is PCV system clogged, but I have done some dis assembly and found no obvious blockage leading to increased crankcase pressure. Any suggestions out there in cyberspace???