[DRiveB]

I'm driving a 2011 N55 F25 X3 , with 53K miles on it. Lately it is getting to be more frequent that exhaust fume smell enters the AC when driving at speed of 55mph -65mph with low rpm. initially I experience this only when revving the engine into the 4-5k rpm. I can eliminate the problem by closing the circulation on the AC , but I'm getting worried as to why it is happening. anyone had the experience to resolve this?

[E90705]

No could be a leaky vcg (valve cover gasket) oil dripping onto the downpipe. Even with a aftermarket downpipe I don't get that exhaust smell from the vents.

[Opie55]

What does it actually smell like? Exhaust itself does not really smell like oil dripping on hot exhaust. Burning oil smells kinda like burning rubber. But I doubt you are actually smelling exhaust gasses.

[DRiveB]

Originally Posted by Opie55

What does it actually smell like? Exhaust itself does not really smell like oil dripping on hot exhaust. Burning oil smells kinda like burning rubber. But I doubt you are actually smelling exhaust gasses.

will try to observe better, first thought that came to mind was as if I was behind a car that has a bad muffler or a car that did not pass emission check

[DRiveB]

Originally Posted by E90705

No could be a leaky vcg (valve cover gasket) oil dripping onto the downpipe. Even with a aftermarket downpipe I don't get that exhaust smell from the vents.

will look in to this , thanks