Turbo Failure/wear Verification

[Ralph Burnette]

I have a 1993 300SD with 214,000 miles on it.

I have a lack of power. I recently traveled to West Virginia
from Connecticut and the car could not hold road speed going
through the mountains (interstate).

I noticed a little some oil leakage at the crossover at the intake
manifold. There also appears to be some oil coming from the
turbo side of the crossover (although it is hard to tell).

Is there anyway I can inspect the turbo to determine whether
or not it is worn? Are there other things to check, too?
Are there any DIY procedures I can use?

Thanks,
-Ralph