For 1990-2009 cars

Checks | Causes
--- | ---
Above acceptable oil consumption, not due to leaks, is the use of 1 L (1 qt) or more of engine oil within 3200 kilometers (2,000 miles).
Preliminary | The causes of above acceptable oil consumption may include the following conditions:

• | External oil leaks

| Refer to Oil Leak Diagnosis.

• | Incorrect oil level or incorrect reading of the oil level indicator.

| With the vehicle on a level surface, run the engine for a few minutes, allow adequate drain down time, 2 - 3 minutes, and check for the correct engine oil level.

• | Incorrect oil viscosity.

| Refer to the vehicle owners manual and use the recommended SAE grade and viscosity for the prevailing temperatures.

• | Continuous high speed driving and/or extreme usage.

• | Crankcase ventilation system restrictions or malfunctioning components.

• | Worn valve guides and/or valve stems.

• | Worn or incorrectly installed valve stem oil seals.

• | Piston rings broken, worn, or not seated correctly

| Allow adequate time for the rings to seat.

| Replace worn piston rings as necessary.

• | Piston and rings incorrectly installed or not fitted to the cylinder bore.