Lubrication System 74 UENR0623-02 Failed valve stem seals Leaks between worn valve guides and valve stems Worn components or damaged components (pistons, piston rings, or dirty return holes for the engine oil) Incorrect installation of the compression ring and/ or the intermediate ring Leaks past the seal rings in the turbocharger shaft Overfilling of the crankcase Wrong dipstick or guide tube Sustained operation at light loads Excessive consumption of engine oil can also result if engine oil with the wrong viscosity is used. Engine oil with a thin viscosity can be caused by fuel leakage into the crankcase or by increased engine temperature.
i03577881 Increased Engine Oil Temperature - Inspect Look for a restriction in the oil passages of the oil cooler. The oil temperature may be higher than normal when the engine is operating. In such a case, the oil cooler may have a restriction.