I can't help but laugh... for the past day, I've been chasing what sounds like the EXACT same problem. Tonnes of white/grey smoke, which smelled like fuel, and not at all like oil. I was balloon testing, trying to cut out cylinders to identify a dumping injector. I was going to remove the manifolds, but since it's an E-box, I thought I would just remove the Y-pipe to figure out which manifold to remove, but then the smoke stopped. When I reinstalled the Y-pipe, it started to smoke like a cheap hooker again. Turns out to have been the turbo leaking on the turbine side. I guess that when the oil isn't being burned in the combustion chambers, but being burned up in the exhaust, it just doesn't have the same smell... lesson learned.