For 1990-2009 cars

Checks | Causes
--- | ---
Excessive oil consumption, not due to leaks, is the use of 1 L (1 qt) or more of engine oil within 3 200 kilometers (2,000 miles).
Preliminary | The causes of excessive oil consumption may include the following conditions:

• | External oil leaks

| Refer to Oil Leak Diagnosis .

• | Incorrect oil level or improper 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 measure for the correct engine oil level.

• | Improper 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 severe usage

• | Crankcase ventilation system restrictions or malfunctioning components

| Refer to Crankcase Ventilation System Inspection/Diagnosis .

• | Worn valve guides and/or valve stems

• | Worn or improperly installed valve stem oil seals

| Refer to Spark Plug Inspection .

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

| Allow adequate time for the rings to seat.

| Replace worn piston rings, as necessary.

| Refer to Cylinder Leakage Test .

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

| Refer to Lower Engine Noise, Regardless of Engine Speed .