nothing
Only if there is a bad oil leak.
Could be a bad seal, which will eventually cause your turbo to go out.
No. No WRX has twin Turbos!
Detroit Turbos was created in 1989.
Detroit Turbos ended in 1994.
If the center housing seals are bad, you will see white smoke coming out the exhaust. Otherwise you'll probably have to get it diagnosed by a mechanic.
They are located directly on the turbos. 300zx have internally wastegated turbos
t/3 t/4 turbos , should be efficient enough.
There are many places online that sell turbos. Some of the popular places you can find them are Turbo By Garrett, Turbos Rugby, Precision Turbo and even on eBay.
Cummins makes there turbos Over the years they have used Garret and Holset.
if the engine is not designed to run turbos it can do a lot of damage. a turbo engine has hardened internals
the turbos shot,i had a problem with my saab it was the pcv valve made it suck oil out of the pan,smoked real bad