Is my turbo failing?

If your turbo impellers aren’t contacting the housing and there is next to no end play your turbo should be fine.

 

Thrust play too. Should have slight end play, and next to no thrust play.

 

If you idle truck at low rpm some will have fuel slobber which looks like oil if clamps are leaking . If turbo is still on warranty sometimes they are hesitant to change it .

 

Turbos used to have actual seals and would not leak at all.
Now the holset has switched to a seal similar to a piston ring where it needs pressure to seal. Without pressure it will puke oil.
If you were to disconnect the boost hose it would puke oil out as it has no pressure on the sealing rings.
A hole in the charge air cooler causes the same thing. International is correct.

 

Might not hurt to replace the crankcase vent filter.

 

Along with boost leaks, and restricted crankcase vents as mentioned above, a restricted exhaust can also cause the pressure differential to make a turbo push oil. Take a look at this chart.