On the passenger side i get a little bit of oil along the top of the exhaust manifold. Not ever enough to show up on the dipstick. This has been present since before i modified the truck at all. Has anyone else experienced this problem? Any input or suggestions would be greatly appreciated.

 

I would say valve cover gaskets are leaking. You need to clean it up than use some spray some of that foot stuff that ends up being white when its applied, I can't remember what it is now(baby powder or talcum powder). The oil will show up really fast in this. Or just get new valve cover gaskets, get the grey ones from cummins, the black ones leak. I know a guy who had his clutch ruined because a shop adjusted his valves and put black gaskets on and oil ran down into his clutch.