The thin oil doesn’t give enough time for the gaskets, liners, rings and bearings to seat properly in a new engine. A brand new engine should not use synthetic oils as they are too thin. Increased oil consumption can also be the results of using the wrong viscosity of oilfor a particular engine. It is also common to see oil leakage issues past the seal rings in the impeller end of the turbo shaft.If the compression and intermediate rings are installed incorrectly it can cause oil leaks.Clogged bearings will build up oil pressure and cause a leak somewhere else. It is also imperative to check for clogged oil return galleries in the bearings.Check for old and worn components such as pistons, piston rings and liners.The most frequent place to check for an oil leakage is between worn valve guides and valve stems.
There are four common ways for oil to leak into the combustion area of the pistons: If oil leaks into the combustion chamber of the diesel engine it is usually a sign of wear and tear somewhere in the engine. If you see blue smoke it is usually a telltale sign of burning oil somewhere in the combustion chamber.
The dirty crankcase breather will cause gaskets and seals to crack and leak. If the crankcase breather is clogged with debris this will cause high oil pressurein the crankcase. This is a very common spot for oil leaks which are caused by a combustion of gas around the pistons. If there are still no leaks you should inspect the crankcase breather. If everything looks fine the next logical place to look for leakage at the oil pan gasket and all lubrication connections. First, look for any oil leakage at the seals at the end of the crankshaft. If nothing is found you can then then work your way up the engine.
The most common place for the diesel engine builder to look for leaks, on the outside of the engine, is crankshaft. Reasons for Excessive Oil Consumption in Diesel Engines Oil Leakage On Outside of Engine