Not sure what bushings post 8 refers to. Every part which touches the spinning shaft came in the $20 rebuild kit I bought. I think oil leaking past the shaft into the compressor housing could drip externally, if the housing O-ring doesn't seal perfectly. Otherwise, the oil would build up until the compressor wheel starts splashing it, then it would get sucked into the engine and burn.

I took the square cover off the waste-gate diaphragm in my Garrett. The diaphragm is a rubber membrane and appeared fine. Perhaps others are steel (post 8). I expect the waste valve is a metal-metal seal (didn't open) and don't know if a seal on the rod (probably just a tight clearance).

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1984 & 1985 CA 300D's
1964 & 65 Mopar's - Valiant, Dart, Newport
1996 & 2002 Chrysler minivans