[rvanderpyl]

I don't understand how you would end up with AL dust in your crankcase if your turbo is lunching itself, unless you have severe blow by on your rings the dust should have just gone right thru the engine and out the exhaust. Did you replace all the bearings and rings? If so you are going to have some metal particles from the break-in, hence why you change the oil after a short period. I would fix the turbo, or remove it for now, change the oil and run the engine for a bit, then change the oil again.