Diesel Oil Dilution and DPF Clogging
SeriousEngineIncomplete DPF regenerations lead to fuel entering the oil sump. If not caught, this can lead to engine "runaway" or bearing failure.
Rising oil level on dipstick, DPF warning light, Frequent "active" regenerations (high idle)
- Check the oil level; it should not be above the "Max" mark
- Ask about the car's typical usage (motorway vs town)