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)

Excellent product, does what it says on the tin. The best fuel additive I have ever used, my engine is smooth and much quieter, will use regularly from now on, 1500 cc diesel, the fuel economy is off the scale, engine has done 60000 miles even though it's been well maintained I certainly found a big improvement in performance.

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.

Not a fan of adatives, but Archoil AR6400 seems to have cleared the injectors and improved the smooth running of my Freelander. It seems expensive, but is actually very effective and good value.

Excellent product. Makes a real difference.

Have a Vw golf my 5 with the Turbo Overboost fault code - it was causing the engine to go into Limp Home Mode every time I accelerated and went over about 2k rpm, so basically all the time. Was resigned to paying at best, £300 for a turbo rebuild, or at worst £900 for a new turbo. Had tried the off-the-shelf Halfords products that purport to clean the engine and its bits, but to no avail. So that was a tenner I would never see again. I was extremely reticent to paying over twenty quid for yet another bottle of Snake Oil, but I was desperate and really did not want to fork out hundreds of pounds. After extensive research, this product appeared to be worth the extra money, and several people with the exact problem I had said it worked, so I thought what the heck, I had nothing much else to loose, so ordered it. Had I not been drowning my sorrows at the time because of the thought of having to shell out hundreds on a car I'd just bought, I wouldn't have ordered this, but I was, and I did. It arrived quickly. I waited until my fuel tank was nearly empty, added the whole bottle then filled up. I then went for a drive. A hundred mile drive down the motorway (Cheltenham, if you're interested) And there was no difference at all. And I thought, oh well. It's my own fault for believing all the hype. There's no substitute for taking the turbo apart and cleaning it or replacing it. And I drowned my sorrows again that night, in a very nice hotel. (Holiday Inn) Next day, I set off back home, down and despondent. And then...... I had driven 50 miles, and something changed. The rev counter shot past the 2k mark and the car kept going. I thought i was mistaken, so I gingerly revved some more, and the car responded perfectly. So I spent the remaining 50 miles dropping down gears to get the revs right up at 60 and 70 mph, and the car worked perfectly. I was astonished and thrilled - quite genuinely it's like I have a new car. It revs freely, it changes smoothly and no longer throws up the Turbo Overboost DTC. This is the very best £25 I've ever spent. Well, except for a night in a bar in Germany a couple of years back, but that's another story. Bottom line - this is the prescription-strength, pharmacy-only answer to engine cleaners. Apparently it's secret is that it survives the combustion process to be able to carry on its cleaning chemical reaction through the whole system, where as the other off-the-(Halfords) shelf solutions are a bit to namby-pamby to cope. I've bought another two bottles, and will run them through the next two tanks in succession, and will continue to buy a bottle every 5000 or so miles as advertised. Incredibly pleased, and relived I don't have to fork out hundreds! Incidentally, if you'd like to learn about the German trip, drop me an email, or, better yet, a bottle of this stuff, and I will avail you.

I noticed a difference in engine sound & performance within no time, great product