Oil Consumption Diagnosis
WARNING: This page is about a different car, the 2006 Pontiac Montana SV6, 2006 Chevrolet Uplander, and 2006 Buick Terraza. However, it is still accessible from the selected car via links, so may be relevant.
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.
- Continuous high-speed driving
- Severe hauling, such as a trailer. This causes decreased oil mileage.
- A malfunctioning crankcase ventilation system
- External oil leaks
- Tighten the bolts, as needed.
- Replace the gaskets and seals, as needed.
- Worn or omitted valve guides and/or valve stem seals
- Ream the guides.
- 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 gaskets