29079 DPF & GPF On-Car Cleaner 500ml

This was very effective done what i need to be done. I previously purchased a different product by JML and used it on my blocked DPF which had accumulated about 38g of soot. This worked great after leaving it in for about 30 mins and got soot content down to 17g. However car was still wanting to do a regen. A week later i purchased this product mainly because it was one of two options to get it next day delivery. I put it in the dpf and let it soak for about 2 hours this time. took car for a drive and within minutes I had the white ash/smoke out of exhaust cleaning the system. After about 30 mins of driving, regen was complete and soot content down to 5.6g. Perfect! This may have been just as good as the other product I purchased, but i think because of the amount of soot that had built up, leaving for longer to soak really helped. I will defiantly buy again if I need to use it. Yes you can smell it as its burning off the soot, and you get strange looks from people as your driving, but it was only maybe 4-5 mins of thick white smoke which is good as you know its working. We have had the car for 5 years and its never done a regen in that time. I now know that someone had turned of the automatic regen on the car, which is what has led to the accumulation of soot build up in dpf. If regen was turned on then we probably would have never needed to purchase this product in the first place. Its quite costly especially when you have had to do it twice. But for now I am happy with the results.

My Audi A4 3.0 TDI (crtc engine code) was in limp mode with blocked DPF caused by faulty EGR valve, now replaced - so had 'drive fault' warnings on start up, cruise control inoperative, no performance. I have the vag-com / vcds cable and software so could see two fault codes, 5188 - particle filter excessive soot - and 5189 - particulate filter bank 1 efficiency below threshold. I warmed the car to normal temperature, removed one of the sensors in the 'upstream' / turbo end of the DPF after soaking it for a few days, then used the whole can of cleaner, spraying into every part of the filter that I could using the long hose supplied - obviously avoid any fumes / wear a proper filter mask. I followed the instructions to let it soak for 30 mins, then started it, let it idle then run at 2,000 RPM then test drive. Initially, no foam came out of the exhaust, unlike in the You Tube video, and at first it seemed to have had no effect. But on the test drive, still in limp mode, grey/black smoke started to come out of the exhaust, for about 15 minutes. When I got back, I cleared the codes, and the car was back to running properly; no warning lights, no limp mode, if anything it felt better than before. I checked the regeneration data and it had just done a 'passive' regeneration on the drive, which it won't do if the fault codes are showing. I was stunned; I was quoted £264 for an on-car clean, this seems to have fixed it for less than £25. Fabulous.

Worked as it should. Great product

It’s pretty good if your DPF is partially blocked. It worked for me for a couple of years of high mileage driving so can’t complain. However in the end I had to have it removed and professionally cleaned.

Followed instructions, Did nothing, had some smoke when holding revs. That's about it. Still blocked, still have flashing glow plug light. Cleared faults, dpf faults came back, calculated soot mass after using 56.12g, soot mass before using 35.89g, so product only helps to block dpf more

Brilliant cleaner used on a bmw 335d with dpf light coming on every journey. Left it for 30 mins to soak, started it up and left it idling for 20mins. Loads of dirty black bubbles from the exhaust then took it out for a fast run, accelerated onto a motorway and left a cloud of grey sooty smoke behind me. Rechecked the fault codes for dpf and cleared them, been driving it for 2 weeks now with no fault codes and a smoother running car, very pleased with Wynns dpf cleaner highly recommended.

Possibly the only dpf cleaner on the market that actually works. Dropped dpf by over 20%. Enough to take limp mode off VWs.

A lot cheaper than paying to have the dpf removed and cleaned. My dpf was blocked badly i put this in left it for 5 minutes then went for a 20 min drive it didn't work until I took the car out the next day for a longer drive then a big cloud of smoke came out and the car had full power again I have my own fault code reader and reset the engine light myself now the car is running perfectly again