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???