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Re: Blown Turbo
To add to Bob's suggestions.
The seals in a turbo are more like piston rings. They let a small amount of leakage past.
In normal operation the exhaust and intake sides of the turbo have more pressure than the turbo housing (which is vented to the crankcase through the drain). So you get a bit of intake air and exhaust gas through the turbo seals and into your engine crankcase.
If the drain gets blocked you get more pressure in the centre housing than the exhaust or compressor. So you get engine oil blown into the air intake and/or exhaust which creates a lot of smoke.
If your throttle is upstream of the turbo, then you'll have a real seal (carbon face sort) on the compressor side to stop the intake vacuum from sucking oil from the turbo.
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