Trucks running great but the other day I was driving and the low level warning came on. I've never had the warning come on in 4 years? The truck has been smoking alot more too.(the like a white cloud every start up) I got a retune and the truck didn't run as well so I put in my old tuneI and cut / dumped my ext right after the muffler and that's the only difference. I'm just worried sumthin could be wrong like the rings ect.. I'm gunna run a compression test but any other ideas? Thanks for the help guys.