For 1990-2009 cars

Cause | Correction
--- | ---
Leaking intake gaskets | Repair or replace the intake manifold bolts and/or gaskets, as required.
Worn valves, valve guides and/or valve stem oil seals |

1. Inspect the spark plugs for oil deposits. Refer to Spark Plug Inspection .
2. Inspect the cylinders for loss of compression. Refer to Engine Compression Test .
3. Repair or replace, as required.

Worn piston rings Oil consumption may or may not cause the engine to misfire. |

1. Inspect the spark plugs for oil deposits. Refer to Spark Plug Inspection .
2. Inspect the cylinders for a loss of compression. Refer to Engine Compression Test .
3. Perform cylinder leak down and compression testing to determine the cause. Refer to Cylinder Leakage Test .
4. Repair or replace, as required.