If you were driving with a bad oil pump, would this affect the turbo in any way? Does the oil pump..
#3
YES! it would definitely affect the turbo!
Oil gets pumped through the turbo, not for cooling, but as a (well two actually) bearings. with out the oil, the turbo is essentially rubbing metal to metal at high temperatures. It wouldn't require too much time running like that for the whole system to sieze.