JLM Diesel Catalytic Exhaust System Cleaner contains a unique blend of additives including an cetane booster and powerful cleaning additives that combine to give a deep and thorough clean of the entire fuel and exhaust system on diesel engines. The formula also contains a DPF Regeneration additive which is specifically designed to reduce the temperature at which carbon deposits are burned off in the Diesel Particulate Filter. This is a big benefit to urban cycle / low mileage diesel cars and LCVs helping to improve performance and significantly reduce maintenance costs.