Checks
| Causes
|
Excessive oil consumption
(not due to leaks) is the use of 0.95 L (1.0 qts) or more of
engine oil within 2,414 kilometers (1,500 miles).
|
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. |
| • | 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 |
| • | 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 miss-fitted to the cylinder
bore |
|
An engine that has excessive oil consumption uses 0.9 L
(1 qt) of oil, or more, within 3 200 km (2,000 mi).
The following list indicates the conditions and corrections of excessive
oil consumption:
| • | An improperly read oil level indicator (dipstick) |
| - | Inspect the oil level while the vehicle is parked on a level surface. |
| - | Allow adequate drain-down time. |
| • | Improper oil viscosity |
| - | Use the recommended SAE viscosity for prevailing temperatures. |
| - | Refer to Maintenance and Lubrication for the proper oil viscosity
specifications. |
| • | Continuous high-speed driving |
| • | Severe hauling, such as a trailer. This causes decreased oil mileage. |
| - | Tighten the bolts, as needed. |
| - | Replace the gaskets and seals, as needed. |
| • | Worn or omitted valve guides and/or valve stem seals |
| - | Install oversized service valves and/or new valve stem seals. |
| • | Broken or worn piston rings |
| • | Improperly installed or unseated piston rings |
| • | Improperly installed or improperly fitted piston |
| • | Plugged cylinder head gasket oil drain holes |
| • | Damaged intake gasket |
