Oil Consumption Diagnosis

WARNING: This page is about a different car, the 2018 Chevrolet Suburban 3500 HD. However, it is still accessible from the selected car via links, so may be relevant.

Checks	Causes
Excessive oil consumption, not due to leaks, is the use of 1 L (1 qt) or more of engine oil within 3200 kilometers (2, 000 miles).
Preliminary	The causes of excessive oil consumption may include the following conditions: External oil leaks Refer to Oil Leak Diagnosis . 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 measure 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 Refer to Crankcase Ventilation System Inspection/Diagnosis . Worn valve guides and/or valve stems Worn or improperly installed valve stem oil seals Refer to Spark Plug Inspection . Piston rings broken, worn, or not seated properly Allow adequate time for the rings to seat. Replace worn piston rings, as necessary. Refer to Cylinder Leakage Test . Piston and rings improperly installed or not fitted to the cylinder bore Refer to Lower Engine Noise, Regardless of Engine Speed .

Checks

Causes

Excessive oil consumption, not due to leaks, is the use of 1 L (1 qt) or more of engine oil within 3200 kilometers (2, 000 miles).

Preliminary

The causes of excessive oil consumption may include the following conditions:

External oil leaks
Refer to Oil Leak Diagnosis .
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 measure 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
Refer to Crankcase Ventilation System Inspection/Diagnosis .
Worn valve guides and/or valve stems
Worn or improperly installed valve stem oil seals
Refer to Spark Plug Inspection .
Piston rings broken, worn, or not seated properly
Allow adequate time for the rings to seat.

Replace worn piston rings, as necessary.

Refer to Cylinder Leakage Test .
Piston and rings improperly installed or not fitted to the cylinder bore
Refer to Lower Engine Noise, Regardless of Engine Speed .