Oil Consumption Diagnosis

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