7.3L oil leak, possible waste gate problem

[antiqfreq]

Hi everyone,
We have been chasing oil leaks for weeks now. Last dealer said it was CAC tubes. (He did fix the smelly fuel problem with a gasket on something)
Two days later, oil leak again. But, it only seems to leak when under load (We pull a 11,000 fifth wheel full time).
So, 2 days later we leave out and stop 4 hrs later and again, oil leaking under the truck.
Take it to a mechanic locally where we are now & he said "It is the O-rings, guaranteed". Today truck is there & now mechanic calls & says it is a problem with the 'waste gate pedestal'. We have no idea what that means; but he says it will take 7 days to get the part.
I don't even know 'what' part yet, or the price to fix this.
Dear Hubby is over there now discussing this situation. If he can put it back together we should probably get a 2nd opinion. Whatever it is, it is probably expensive!
Any opinions here? Does this mean a new turbo or something??
Thanks,
Jo

[DirtyDiesel]

its either the turbo pedistal o-rings (cheap) or the EBPV actuator leaking. if its the latter then id prolly jus do an EBPV delete and save the money hes gonna charge u for a new pedistal/actuator o-rings.

the EBPV is a flap inside the outlet of the turbo that closes in cold weather to help the motor warm up.

[melmount]

remove that stuff and plug the holes.