Engine Oil Deteriorated
The oil quality monitor concludes that the engine oil has reached the end of its useful life — based on permittivity, soot content, fuel dilution and total operating hours. The ECM requests an oil change before the next regen cycle to prevent accelerated bearing wear.
Affected components
- Engine oil
Common causes
- High likelihood: Service interval exceeded
- Medium likelihood: High DPF regeneration load with fuel dilution
Diagnostic notes
- The malfunction indicator lamp may illuminate
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.