This bulletin provides information on higher than expected oil consumption in certain models of Chevrolet and GMC vehicles at or above 8600 GVW.
Understanding Oil Consumption
Oil consumption has a direct relationship with fuel used, and the accepted rate of oil consumption for gasoline engines in vehicles at or above 8600 GVW is 0.946 liters (1 qt) within 379 liters (100 gallons) of fuel used.
Factors Affecting Oil Consumption
Driving habits and vehicle maintenance vary from owner to owner, and many factors can affect an owner’s concern with oil consumption.
Testing for Oil Consumption
To ensure accurate results, it is recommended to follow the steps outlined in the bulletin, including verifying the oil level, engine temperature, and PCV system operation.
Diagnosing and Repairing Oil Consumption Issues
The bulletin provides guidance on diagnosing and repairing oil consumption issues, including checking for external leaks, gasket and oil pan leaks, and PCV system blockages or restrictions.
Manual:
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