The only thing pulling the dip stick out might do is release some back pressure from blow by but i cant see that being an issue, plus if there was any it would blow the dipstick out anyway. On such a new car like an ST its very unlikely plus it would have no relation to the turbo what so ever.
I would pull off the hose to the turbo and check for play in the shaft, if its starved of oil its already shagged. You sure its not just a leak