Code result
P253F
Engine Oil Deteriorated
Moderate severity
What it means
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.
Is it safe to drive?
Use caution
The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical.
Most likely causes
Service interval exceeded
highOne of the most commonly reported causes for this code — check this first.
High DPF regeneration load with fuel dilution
mediumA plausible cause — test and verify before replacing parts.
Related help
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