Restricted air system

Inspect for clogged air filter element or restricted air inlet system.

Restricted exhaust system

Inspect for a restricted exhaust.

Leaking exhaust system.

Inspect for exhaust manifold leaks.

Poor oil drainage from turbocharger

Inspect for restricted turbocharger oil drain pipe.

Restricted crankcase ventilation system

Inspect for restricted crankcase ventilation system.

Worn internal engine components

Inspect for excessive blowby or engine oil consumption.