So my 2013 6.7 has been smoking as of recently. Purchased this truck not too long ago, with 120k. It's fully del*ted and on a canned H and S. This issue seems to have developed over night apparently. Noticed it first when I was starting the truck and notice a cloud of blueish-white smoke came out of the tailpipe. Didn't think much of it and continued driving, I figured it was weather related since the temperature recently dropped here and been about 30* the past 2 weeks. The smoke continues when I take off and is present even when the truck is fully warmed up.

Once it's warm you can see a slight haze, but revving the motor you can see it coming out pretty well. I've checked the injector contribution test with Forscan as well as the fuel balance correction where they range from -1.61mpg to 1.35mg. All of them are pretty close, the one that seems to be pulling fuel is cylinder 3. On the fuel quantity PID all of them are within 0.20 mg of each other. Not sure if any of these are reliable ways of ruling out a bad injector on the 6.7. But i would think if it was an injector it would be white smoke? Mine is blueish-white. I have not had any coolant loss nor can smell any coolant. The "blow by" oil cap test appears normal.

I was initially thinking maybe turbo seals, but it smells like diesel and not at all like burning oil. Truck runs great, no hesitation and builds boost without issue. Anyone have any ideas? I'd like to think it's weather related but I'd like to find an issue before it gets worse.

Smoke video

 

I would address this with your tuner. I think you are overfueling and washing the cylinder.

 

Were you able to figure this out? I'm having similar issues.