Oil leakage from turbocharger compressor seal (A20NFT/LHU)

Criteria	Event
Reduced air system	Check whether the air filter is blocked or the air intake system is reduced.
Reduced exhaust system	Check whether the exhaust gases are reduced.
Leaking exhaust system	Check whether the exhaust pipe is leaking.
Lack of oil drainage from the turbocharger	Check that no oil drain pipes are blocked.
Blocked crankcase ventilation system	Check that the crankcase ventilation system is not blocked.
Worn inner engine parts	Check for excess engine oil consumption or blowby.