Engine Lubrication Symptom Troubleshooting

Symptom  Diagnostic procedure Also check for 
Excessive engine oil consumption 1.

2.
3.

4.
5. 
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 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.