POTENTIAL CAUSE
1. Insufficient intake air volume.
2. Partially plugged oil drain tube.
3. Oil Leaking past worn compressor or turbine side seals.
4. Engine problem caused by worn rings, or valve seals.
CORRECTION
1. Disassemble, inspect, and clear any restrictions.
Replace damaged, worn ducting parts.
2. Remove and clear tube. Replace tube if fully plugged, pinched, or kinked.
3. Replace turbocharger.
4. Overhaul cylinder heads or engine as needed.
