[blackrosenova400]

Uh, if it is the rings, then it is coming from the crankcase. It is entirely possible that after boosting and letting go of the throttle, crankcase pressure forces oil from the cylinder wall past the oil ring as the piston is on its way down on it intake stroke.

Good idea, check your spark plugs, if there clean move on from the crankcase idea. If your not satisfied heres what id do.

Lift up all drive tires off the ground, drive it and slowly get it in 5th gear at low rpm. Give it wide open throttle and let it go after redline, let it puff its smoke then immediatly shut off. Let it cool down. Remove the exhuast manifold and turbo. Look at your exhaust ports, if there clean then its your turbo.

With these cars, highly probable chance its the turbo. Make sure your air filter is clean. Alot of restriction can cause oil to get sucked into the intake tract though the compressor wheel.