95%
1.
Incorrect or poor quality filter and/ or engine oil An overdue filter or oil change A faulty filter bypass valve Deposits of carbon, water or fuel in the system
2.
Gasket material, rag particles, washers and other small objects within the air intake system A leak within the air intake system Fragments from the failed turbo in the system
3.
Low oil level, or a worn oil pump Blockages ( e. g. kinked pipes or carbon deposits) Leaking pipes Leaks and blockages within the exhaust and air system can alter the pressure at the turbo, causing an oil leak
4. Other
Hot engine shutdown, which produces carbon, damaging turbo bearings Not allowing sufficient time for oil to protect the turbo when accelerating hard from a cold start- up Idling the engine for long periods, creating a vacuum which can damage the turbo seals Exceeding the engine rev limit, over speeding the turbo beyond the ability to protect it. This causes over boost, damaging the engine.
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