I have a 2004 350z touring edition and for some reason I keep smelling burning oil in the cabin, especially when I come to a stop. I had both of the valve cover gaskets swapped and one valve cover itself but I still smell it. (she has 98,000 miles on her) As far as I know I don't see any leaking. Does anyone else have any ideas? I heard that maybe a catch can could help? Please let me know, I'm getting a headache from the smell!

 

Exhaust leak, probably from your exhaust manifold gasket or rear manifold collector/connector has 3 bolts and a triangular gasket. If you take it to a shop with a smoke machine they can pinpoint where it's leaking from.