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If the turbo shaft broke, it's very possible that there's still lots of oil in the intake and exhaust. Did you clean all oil out of the intake?

There's not much you can do to clean out the exhaust other than drive the car. It will burn out over time.

Make sure you put back all hoses and do a boost leak test. Replacing the turbo should not cause hard starting. When was the timing belt last changed?
 

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If there was a lot of residual oil it could cause hydrolock. Basically, oil is non compressible. A little bit can be burned up. But if there is too much, instead of burning up it causes too much pressure so something has to give way. Normally it's the piston rods. Maybe the head gasket could blow instead. But the greatest risk is when the turbo first blew because the turbo was actively pumping oil out.

I am assuming that the turbo was broken on the intake side right?
 
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