Detroit Diesel DD15 EuroIV Operator's Manual page 106

Troubleshooting
Abnormal Operating Condition Symptoms and Probable Causes
Worn/broken oil control rings
Scored liner and/or piston
Excessive engine installation angle
Crankcase overfilled
Oil in air tanks (air compressor malfunction)
Plugged crankcase breather
Oil level low
Improper engine oil viscosity (fuel in the oil)
Faulty oil pressure regulator valve
Worn crankshaft, camshaft or connecting rod
bearings
Faulty oil pressure relief valve
Air leaks in oil pump (suction side)
Worn or damaged oil pump
Faulty oil pressure gauge
Faulty electrical components (for gauge)
Plugged oil line or orifice
* Indicates high crankcase pressure
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