Oil Consumption Diagnosis
WARNING: This page is about a different car, the 2003 GMC Sonoma and 2003 Chevrolet S10 Pickup. 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 of a minimum of 10 minutes at operating temperature.
- Improper oil viscosity
- Use the recommended SAE viscosity type.
- Continuous high-speed driving and/or high load operating conditions
Severe hauling, such as a trailer. This causes decreased oil mileage.
- External oil leaks
Replace the gaskets and seals, as needed.
- Damaged intake manifold gaskets
- A malfunctioning crankcase ventilation system Verify PCV flow orifice sealing.
- Plugged cylinder head gasket oil drain holes
- Worn or damaged valve guides, valve stem seals, valve and/or valve stems
- Refer to CYLINDER HEAD CLEANING AND INSPECTION .
- Refer to VALVE GUIDE REAMING/VALVE AND SEAT GRINDING .
- Damaged or worn pistons
- Broken or worn piston rings