Today I installed a small normally open solenoid valve on my turbo oil supply line. An AME that happened by was questioning how exactly that I would know that my turbo bearings were failed and loosing oil. I couldn't give him an answer that he was satisfied with and he now has me questioning whether I would know with a reasonable degree of certainty.

  So exactly what did your turbo do when it failed that made you certain of what it was.

  I figure that if I got it wrong and cut off oil when it was still working, then worst case is that I just destroy $1AMU turbo, but most likely it would just destroy the bearings.

Todd