| The Problem | Is Caused By | What To Do |
|---|---|---|
| External oil leaks | Cylinder head cover RTV sealant broken or improperly seated | Replace sealant; inspect cylinder head cover sealant flange and cylinder head sealant surface for distortion and cracks |
| Oil filler cap leaking or missing | Replace cap | |
| Oil filter gasket broken or improperly seated | Replace oil filter | |
| Oil pan side gasket broken, improperly seated or opening in RTV sealant | Replace gasket or repair opening in sealant; inspect oil pan gasket flange for distortion | |
| Oil pan front oil seal broken or improperly seated | Replace seal; inspect timing case cover and oil pan seal flange for distortion | |
| Oil pan rear oil seal broken or improperly seated | Replace seal; inspect oil pan rear oil seal flange; inspect rear main bearing cap for cracks, plugged oil return channels, or distortion in seal groove | |
| Timing case cover oil seal broken or improperly seated | Replace seal | |
| Excess oil pressure because of restricted PCV valve | Replace PCV valve | |
| Oil pan drain plug loose or has stripped threads | Repair as necessary and tighten | |
| Rear oil gallery plug loose | Use appropriate sealant on gallery plug and tighten | |
| Rear camshaft plug loose or improperly seated | Seat camshaft plug or replace and seal, as necessary | |
| Excessive oil consumption | Oil level too high | Drain oil to specified level |
| Oil with wrong viscosity being used | Replace with specified oil | |
| PCV valve stuck closed | Replace PCV valve | |
| Valve stem oil deflectors (or seals) are damaged, missing, or incorrect type | Replace valve stem oil deflectors | |
| Valve stems or valve guides worn | Measure stem-to-guide clearance and repair as necessary | |
| Poorly fitted or missing valve cover baffles | Replace valve cover | |
| Piston rings broken or missing | Replace broken or missing rings | |
| Scuffed piston | Replace piston | |
| Incorrect piston ring gap | Measure ring gap, repair as necessary | |
| Piston rings sticking or excessively loose in grooves | Measure ring side clearance, repair as necessary | |
| Compression rings installed upside down | Repair as necessary | |
| Cylinder walls worn, scored, or glazed | Repair as necessary | |
| Piston ring gaps not properly staggered | Repair as necessary | |
| Excessive main or connecting rod bearing clearance | Measure bearing clearance, repair as necessary | |