Archoil AR6400-D MAX Pro Diesel DPF, Turbo, CAT, Injector Cleaner - 400ml | Complete Diesel Engine Cleaner - Entire Fuel System, Particulate Filter & Combustion Area - EGR & Turbo Additive for MOT Pass

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.

Really does what it says on the tin unlike many diesel system cleaners on the market, already my Ford Kuga 2018 1.5 tdci whic has done 100,000 miles has improved performance and engine sounds smooth, seems to have cleaned out turbo as an added bonus, very happy to recommend this product which was simple to use, and very well priced for what it achieves, I'd give it 10/10 for its cleaning performance.

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.

This is a good product. The cleaning performance must be good, as there was a notable improvement with how acceleration appears to feel much smoother and responsive. I'm not sure it got everything, so I'll definitely use it again. It's very easy to use, just pour in the tank fill up and off you go.I drive a Hyundai diesel i30, not a performance car, but usually very good for fuel economy which I'm sure will improve with this product.I'm not sure I'd buy it if it was more expensive.

Skoda Yeti 2.0 TDI CR170, 84,000 miles. Felt a bit sluggish, and was recommended this.Added a 400ml to a 50 litre fill-up of basic Supermarket diesel, (the AR6400-D already has all the additives the premium has) and took it out for a 40 mile ‘spirited drive’.Everything now runs quieter, she revs easier, the sluggishness has disappeared, the turbo kicks-in earlier and much stronger, the fuel economy has improved, and the performance now matches the claimed figures.If your DPF is completely ‘bunged-up’ then this isn’t a miracle cure, (you’re going to have to bite the bullet and have it removed for a deep clean) but regular use will stop it getting that bad.Will be using every 5000 miles from now on, and running AR6900-D in every other tankful.

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.

Great item does excellent what it should do

Jury is out as I have not seen any difference and it’s been a while now , there is only one way to clear a Dpf take it off and clean it