Some 2023 Chevrolet Express owners report excessive oil consumption between changes. Understanding causes and monitoring procedures helps manage this concern in commercial fleets.
Express Engine Oil Consumption
Both the 4.3L V6 and 6.6L V8 can experience higher than expected oil consumption. The V8's AFM system adds complexity to oil consumption issues.
Causes of Oil Consumption
AFM System (V8)
The Active Fuel Management system's oil consumption to operate lifters and the complex valve train can contribute to oil use.
Piston Ring Design
Modern low-tension piston rings reduce friction for efficiency but may allow more oil past rings, especially during AFM cylinder deactivation.
Valve Stem Seals
Worn valve seals allow oil into combustion chambers, especially during deceleration. Blue smoke at startup indicates this issue.
PCV System
Improper PCV operation can increase oil consumption by allowing oil vapor to enter the intake in excess.
Monitoring Procedure
Check oil regularly, document consumption rate, and compare to GM's specifications to determine if consumption is within acceptable limits.