Can't really tell the smell. It's not sweet. It smells like exhaust smoke. Like if u had a bad exhaust leak it'll smell like that. Usually the smell left on my clothes You can tell if it's smelling like gas or what not. In this case it smells more like oil. Coz gas and coolant smell is pretty easy to tell. The smell is more like just exhaust gas. The plugs do get kinda wet. Kinda smells like fuel. Last time i pulled them. But before pulling all 6 one was misfiring due to oil fouled plug that was pretty wet at the tip. So it's weird.