Engine Lubrication Symptom Troubleshooting

Symptom |  | Diagnostic procedure | Also check for
--- | --- | --- | ---
Excessive engine oil consumption | 1. 2. 3. 4. 5. 6. | Check for worn valve guide(s) or worn valve stem seal(s). Check for damaged or worn piston ring(s). Check for damaged or worn engine internal parts (cylinder wall, pistons, etc.). Check for oil leaks. Check the operation of the positive crankcase ventilation (PCV) system. Check the engine oil for dirt or improper viscosity. |
Low engine oil pressure | 1. 2. 3. 4. 5. 6. | Check the oil screen for clogging. Test the oil pump. Check the relief valve. Test the oil pressure switch . Check for excessive clearance in the engine (bearing-to-jounal, etc.). Check the engine oil for dirt or improper viscosity. |
High engine oil pressure | Check the relief valve. |