Use every 2-3 tanks or when DPF light comes on
Cleans blocked diesel particulate filters
Clears soot blockages fast
If you have a modern diesel car, it will most likely have a Diesel Particulate Filter which can become blocked and be expensive to repair. Redex DPF Cleaner lowers the temperature the soot burns at, meaning it burns away during normal driving without you having to get your engine very hot.