Excessive engine oil consumption
| Cause | Remedy |
| Clogged air filter element. | Replace element according to engine manufacturers recommendations. |
| Obstructed air intake duct to turbo compressor. | Remove obstruction or replace damaged parts as required. |
| Obstructed air outlet duct from compressor to intake manifold. | Remove obstruction or replace damaged parts as required. |
| Obstructed intake manifold. | Refer to engine manufacturers manual & remove obstruction. |
| Air leak in duct from compressor to intake manifold. | Correct leak by replacing seals or tightening fasteners as required. |
| Air leak at intake manifold to engine joint. | Refer to manufacturers manual & replace gaskets or tighten fasteners as required. |
| Obstruction in exhaust manifold. | Refer to engine manufacturers manual & remove obstruction. |
| Restricted exhaust system. | Remove obstruction or replace faulty components as required |
| Gas leak in exhaust manifolds to engine joint | Refer to manufacturers manual & replace gaskets or tighten fasteners as required. |
| Gas leak in turbine inlet to exhaust manifold joint. | Replace gasket or tighten fasteners as required. |
| Fuel system defective or maladjusted. | Refer to engine manufacturers manual - replace or adjust faulty component(s) as required. |
| Fuel system defective or maladjusted. | Refer to engine manufacturers manual - replace or adjust faulty component(s) as required. |
| Engine camshaft timing incorrect. | Refer to engine manufacturers manual & replace worn parts. |
| Worn engine piston rings or liners (blowby). | Refer to engine manufacturers manual & repair engine as required. |
| 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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