Archoil AR6400-D MAX Pro DPF Cleaner Diesel Fuel System, Diesel Injector Cleaner, Turbo, CAT Cleaner Concentrate - High Strength Carbon Removal & Exhaust Emissions Reduction for MOT Pass (400ml)

Had my emissions light come on in my 09 Audi Q5 3.0 tdi and tried Liqui Molly first. Light was back on on the next fill up. Called a carbon cleaning company in town to set up an appointment and they suggested I tried Archoil AR6400-D Max first. I was reluctant at first as I just wanted my system cleaned once and for all without spending another 20 quid. I purchased and followed the directions and 5 months later, the emissions light is still off and getting great MPG. I'll purchase this again and run it through every 5K miles as suggested.

This stuff works. You will not regret buying. Cleaned 80% of blocked dpf. Took the eml warning off aswell. Car engine drives likes its brand new. Defo stocking up on these.

Must admit I was sceptical that any fuel additive did anything other than waste money. However, my old diesel engine was starting to idle heavily so I decided to give an additive a try. Research on the web suggested Archoil was one of the better ones.This size of bottle is sufficient for one tank of fuel. Run your tank low and take the Archoil bottle with you to the station. Break the foil seal on the bottle and tip the bottle into the fuel tank. The long thin neck on the bottle means it goes down the fuel inlet with no splashing of the contents. Then fill up with Diesel, this will give the correct concentration of additive for a typical family sized car.I used to get around 600 miles per tank, used plus remaining miles always hovered around a total of 600 figure, now it is around 680 miles. But the biggest improvement is in engine idling, the engine is much quieter now.I do not experience any improvement in acceleration so I am still sceptical about the claims for improved performance but miles per gallon and a smoother idling are definitely improved for my 2 litre TDI engine.

A single 400ml bottle of Archoil's AR6400-D MAX Pro has completely transformed my BMW 520d, resolving a host of frustrating issues and saving me from what I feared would be a costly visit to a specialist. For any owner of BMW's otherwise brilliant diesel engines, this high-strength fuel system cleaner is an absolute must-try.My 520d, a car I rely on for its blend of performance and economy, had started to feel tired and unhealthy. The once-sharp acceleration had become noticeably sluggish, there was a definite hesitation when pulling away, and I’d spotted the dreaded puff of smoke from the exhaust when accelerating hard. With an upcoming MOT, the potential for DPF and emissions-related problems was a major worry.These symptoms are unfortunately common for many modern diesel cars, including the venerable BMW 520d. Carbon build-up across the fuel system, clogged injectors, and a struggling DPF and EGR system, often worsened by urban driving cycles, can strangle the engine's performance and efficiency.Having seen positive reports about Archoil AR6400-D, I opted to try it before committing to expensive diagnostic and repair work. I added the full bottle to a tank of premium diesel and made sure to give the car a good, long run on the motorway to let the powerful cleaning agents circulate properly.The difference is, frankly, night and day. The most immediate improvement was the restoration of the car's responsiveness. That annoying lag has vanished, and the engine now delivers the smooth, eager performance I expect from a BMW. It feels sharper, stronger, and pulls cleanly through the entire rev range.Crucially, the tell-tale smoke from the exhaust is gone. This gives me huge confidence for the impending MOT, as it's a clear visual sign that the AR6400-D has done its job of clearing out soot and carbon deposits from the engine and exhaust system.The entire driving experience has been elevated. The engine runs more quietly and feels significantly smoother, both at idle and on the move. It's as if the Archoil has performed a comprehensive internal detox, allowing the injectors, turbo, and DPF to function as they were designed to.For any BMW 520d owner experiencing a decline in performance, rough running, or facing anxiety over DPF and emissions warnings, I cannot recommend the Archoil AR6400-D MAX Pro enthusiastically enough. It has proven to be a remarkably simple and cost-effective solution that has genuinely resolved all the running issues my car had developed. Consider it an essential part of your annual maintenance schedule to keep your BMW performing at its peak.

I was struggling a lot with my 2017 Toyota Avensis diesel engine due to a full DPF warning on the display. I tried many products, but nothing worked. Finally, I decided to visit a mechanic, who told me they could clean the DPF but warned that my low daily mileage would cause it to fill up again. Then, my office security guy advised me to use half a bottle of Archoil 6400 in a full tank and drive at least 60 miles. Once the DPF full message cleared, he recommended using Archoil 6900 at a ratio of 1ml per liter during every refuel to prevent clogging. I followed his advice, and I’m very impressed, this is the only product that truly works. I highly recommend it to anyone struggling with a full DPF. Thanks!