The accepted rate of oil consumption, not due to leaks, is the use of 0.946 liter (1 qt) or less within 379 liters (100 gallons) of fuel used. This rate only applies to vehicles under warranty, maintained in accordance with
the appropriate maintenance schedule, driven at legal speeds and within design intent of the vehicle.
Oil economy should not be tested until the vehicle has accumulated at least 8000 km (5000 mi) and the oil has been changed for the first time. During initial engine break-in periods before the first oil change, oil consumption may exceed
1.9 liters (2 qts) or more per 379 liters (100 gallons) of fuel used.
Checks
| Causes
|
Preliminary
| The causes of excessive oil consumption may include the following conditions:
| • | 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 check for the correct engine oil level. |
| | 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 |
| • | Oil residue in the charge air cooler system is normal with a closed PCV system |
| • | Worn valve guides and/or valve stems |
| • | Worn or improperly installed valve stem oil seals |
| • | Piston rings broken, worn, not seated properly |
| | Allow adequate time for the rings to seat. |
| | Replace worn piston rings as necessary. |
| • | Piston and rings improperly installed or improperly fit to the cylinder bore |
|
