My car (Citroen C3 II) recently got its "DPF clogging" light on. As suggested in the manual, I have driven at lower gear / higher RPM for some time, and the light shut down. However, since I expect to have less long trips and more city driving in the future, I fear the light may come back.
I have seen fuel additives in auto shops and online which favor DPF de-clogging. They are typically called "DPF Cleaner" or "Regenerator", come in cans of 0.2 to 1 L containing petroleum naphtha (white spirit?) and isoalcanes C11-C15, and are to be added before tanking up. Reviews on amazon and similar sites are mostly positive, but I'd like a more professional opinion on the subject:
- Do such additives really work or are they snake oil? Are there any lasting negative side effects?
- Considering that the DPF de-clogging cycle is around 10-30 minutes, does it make sense to add half a dose into half a tank of fuel and save the rest for later?
- Are ODBII readers useful to diagnose the exact problem, or will I only see generic error codes like P2456?