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An fuel additive for Diesel Particulate Filter ? - rtj70
Apart from the liquid needed for some earlier filters on PSA cars (FAP filter needing Eolys).... nothing more than diesel needed.

If the temperature is high enough it burns off the DPF filter. If not more DIESEL is added so it burns it he exhaust to burn off the particulate matter on the DPF.

This is verging on technical so may be moved there if that is how the thread goes.