Oil leak from turbine seal
| Cause | Remedy |
| Gas leak in ducting after the turbine outlet. | Refer to manufacturers manual & repair leak. |
| Obstructed turbocharger oil drain line. | Remove obstruction or replace line as required. |
| Obstructed engine crankcase vent. | Refer to engine manufacturers manual, clear obstruction. |
| Turbocharger centre housing sludged or coked. | Change engine oil & oil filter, overhaul or replace turbo as required. |
| Worn engine piston rings or liners (blowby). | (blowby). |
| Internal engine problem (valves, pistons). | Refer to engine manufacturers manual and repair engine as required. |
| Dirt caked on compressor wheel and/or diffuser vanes. | Clean using a Non-Caustic cleaner & Soft Brush. Find & Correct source of unfiltered air and change engine oil & oil filter. |
| Damaged turbocharger. | Find the correct cause of failure, replace turbocharger as required. |
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