2000 7.3L POWERSTROKE oil smoke out of exhaust

[Hawks]

I just pulled off the freeway, and noticed my truck blows huge clouds of blue oil smoke out of the exhaust when I let off the throttle. Any thoughts on what it is? I was thinking maybe the turbos shot or maybe needs new o-rings. Any thoughts would be appreciated!

[dray8165]

In a gas motor, that would be diagnostic of valve seals, because the motor draws a vacuum when the throttle is closed. In the diesel, you are on the right track with your ideas. When you are on the throttle, you are burning diesel injected through the injectors, and any oil that makes it past the o-rings. When you let off the throttle, the injectors stop firing while you are decelerating (on my truck, until the torque converter unlocks) - at which point you would be burning only the oil passing the o-rings.

However - because you say huge clouds of smoke - I'd be looking at the turbo first.

[podirtfarmer]

was doing same thing replaced all the injector O-rings now no issues

[Hawks]

Right on, thanks for the replies. I'll let you know when I figure it out.