How to kill a turbo 101:
1) Lack of oil - This can be accomplished a number of ways, a blockage is possible but not common from what I've heard.. Low motor oil while trying to drift is when this one seems to become the choice method for the turbo's departure.
2) Overworked/overspun - Boost leak. With a boost leak the turbo will have to work extra hard to make up for a pressure being dumped from the system. So, if you've got a leak that's venting 5psi the turbo has to make 17psi to actually get you 12psi at the manifold.
3) Overworked/overspun (part 2) - Seized wastegate. You be seeing ever increasing boost from this as the device used to control the boost pressure in the manifold isn't opening allowing the turbo to slow.
4) Broken shaft in the turbo due to compressor surge. This can occur if the BOV isnt up to the task or is inoperable... I don't know how common it is though, the CT-26 is pretty robust. This could also occur due to the stresses induced by any of the problems listed above.
5) Excessive oil pressure - A blockage in the oil drain from the turbo can cause the oil to back up VERY fast. This can result in a blown oil seal. Generally you'd find yourself burning a lot of oil though; I don't know how likely seizure is.
These are the reasons I know of, there may be some things I'm not thinking of or tham I'm unaware of.
What weight oil have you been running?
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