A few months back I started to notice a bad smell coming into my cab - smells like synthetic gear oil or something. It happened only when I got into my truck after I had it up to temp, then shut it off, hooked up my trailer, then got back in...there was the smell.

Now it has become a lot worse. When the engine gets up to temp and I stop at any intersection I smell it. Even when going down the highway now it is faintly there.

Today when changing the engine oil, the smell is even in the engine bay. But no leaks that I can see.

I'm taking it into a Dodge dealership tomorrow as I can't stand it any longer and it's getting too cold to roll down the windows. Any thoughts?

 

Two thoughts. One, for about a thousand miles after changing my oil my truck will stink like crazy, very common problem. Two, I had issues with the cp3 leaking this summer. Just a small leak, but would stink like crazy every time I came to a stop. Changed under the 3/36 warranty. Hope this helps.

 

Found out it was the front diff. I used Amsoil and thought it would last longer than it did...funny. I guess there is some sort of pickup hose nearby that the have any fumes there travelling into the cab...weird design if you ask me.