AR6900-D MAX Advanced Diesel Additive Concentrate - 1 Litre

I've yet to see the cleaning power as i'm not testing it and comparing before and after in my diesel car but the improved starting capacity has been noticed as I used about 30ml whilst on about 35 ltrs of diesel in a 50ltr tank. I will check my egr in a week or two to see how much it's helped keep that clean as I disconnected my egr to partially clean it whilst in place just before using this product. For the price you get more than one use worth, you get quite a few so this is a product to last over a year depending so for maintaining the fuel and helping the system it's well worth the money. I'm already seeing an improvement to my average MPG which while pottering about town doing short trips is very beneficial. EDIT: After 7 months of use doing a lot of short journeys I can say without a doubt this is a perfect product for keeping a diesel in optimal health as my system runs better, it's cleaner and i'm never having issues with starting, my average mpg has risen to 31mpg which is a huge improvement over the 22mpg I was seeing before I started using it, and if i go on a longer journey it continues to rise until im back to my working day routine doing short trips, and if i take my car out on the NSL roads i'm seeing upwards of 36mpg - did i mention that cold starts aren't an issue anymore? The engine runs so much better with this product in it with the correct amount ie 1:1000 ratio so 1 ltr=1ml, for my 53 ltr tank i need two squirts of this bad boy as they are about 25ml each. I swear by this product as i've had concerns about my dpf and egr getting clogged and being at risk due to my driving habits and after having my egr out twice over the last 7 months to inspect it i can confirm this product is actively cleaning the system, it's not making the egr spotless but the buildup of carbon has been drastically reduced and the EGR is less like a carbon-geode cracked open, even my egr valve solenoid is relatively clean. I'll be forever buying this and adding 70ml to every tank before i top up with new fuel, it's a incredibly affordable product that works like a charm! Please do wear gloves when handling the bottle as while it's not the worst smell in the world you don't want it getting on your hands and then on the interior of your car where you will smell it for weeks.

Was reccomended to try this by a mechanic, after I had a service done. I've always used Redex once a month, to keep fuel system clean, and always achieved 60-65mpg. Using Archoil in every tank now for the past month, and I'm achieving amazing results on my daily urban commute. Engine responds better and the mpg is unheard of before, for a 2ltr Passat diesel estate with 119,000 miles on the clock.

Rated 4 stars as have no long term Data , I put a few treated tank fills through my mk7 ford transit , 175k on the clock , I wouldn't say it transformed the engine performance, but it is definitely smoother and seems to pull a little better .. a bit like the human equivalent to getting a good night's sleep 😅. And yes I guess I would compare I to putting premium diesel in , but then are you really saving much money in adding it yourself. I would have to do the math, but suspect there wouldn't be alot in it with the price of fuel in the UK. But long story short , seems good 👍

bought last october 2025,.been using this additive now for 5 months, i left this review so it could be pretty accurate, skoda rapid spaceback 2016, i add the recommended 50mil to 50 litres at every refuel, my fuel economy has gone from average 52mpg to 60mpg my last regen light was 5 months ago when i first purchased this item, now the car regens as driving and the stop start system has improved, never can really understand how it works so times it does sometime it does not but i normally drive with it turned off anyway as it can be annoying especially on roads with many traffic lights over a shortish period, that constant stop start when only moving minimal distance cant really save that much, i used to have a slight shudder/hesitation in low revs some times for a few secs which i thought was possibly dirty injectors, since using this product that problem really has gone away and the vechicle power has definitely improved, it is done 188500 miles and is still a very good car to drive . i will now put this on 6 month subscription as i still have some left from the original purchase and i am very happy with product and i would advise anybody with a diesel engine to use this stuff

I ran redex additive for years on my Audi A2 tdi and found no difference, since being recommended this stuff I will never use any other product , engines quieter and car runs do much smoother , only downside is it stinks 😷 this product seems to spread by word of mouth as i have since got other motorists now using it

Excellent additive, been using Red x diesel in every tank since I bought my car, was recommended to by dealer. Was an ex demo SUV, had car 10 years, 2.2d turbo intercooler, 178PS , usually get 48 mpg per tank, car can do 0.60 mph in 9.9 seconds though rarely have I attempted that!! lol Keep car serviced annually as per manufacturers service schedule. Kerb weight is 1700kg without driver, a fairly heavy car, performance & economy has always been outstanding, in my opinion, hence decided to keep this car until it starts costing too much for servicing. As Red x seems too expensive now, thought I'd try something else, read reviews on here, and decided upon Archoil AR6900-D and I'm not disappointed. Archoil AR6900-D is exceptional, in my opinion, whilst I wasn't looking for more performance, I've got it, feel like I've suddenly got a sports car. For my car it worked instantly, been overtaking everything in sight. So easy to use, was going on a 200 mile journey, so thought a good test for this. So simple and easy to measure via a cap within a cap, I.E., the outer cap unscrews which is essentially a cover for a nozzle, pour it in then add fuel like I used to do with Red X. As this is my first use of this over a fairly decent journey, I'm ditching Red X, that's for sure, I used more fuel, as was enjoying the overtaking and acceleration so much. The journeys economy dropped to 45 mpg, still acceptable to me, as enjoyed the extra performance, and the engine feels more smooth and quieter. As some other respondents have mentioned, starting a diesel can be an issue, that's been the only downside of this car, it's never liked starting from cold, always starts first time after engine warmed up, had similar issue on all previous diesels, though not as bad as this one. Usually takes at least 2 attempts in summer, 3-4 in winter. Was same when new, was informed about this by the dealer, have to let car idle for 5 mins also before driving also to allow oil to lubricate the turbo, have started from cold several times since adding Archoil, and it starts first time every time. As of writing this in UK in July 2026 it is hotter than usual for us in south England, and it did used to start better when hot outside, but it has never started first time before. The real test will be winter, but any improvement will be helpful. Rather than needing a new costly battery every 2 years, if this helps starting as much has it has already, I'll be saving loads of money, it's also possible this additive may even extend the life of the car.

What an excellent liquid! Ive been using fuel system cleaners for years..about 30 years to be exact..i had never heard of this make. I had been using makes like wynns and holts..etc. My god!...THEY ARE COMPLETELY RUBBISH compared to this!! After putting it in the first tank load you can feel the..difference. You would think that its expensive but its ALOT cheaper rhan the rest of the makes. I used Wynns fuel system cleaner a week before i bought this. It made hardly NO difference to the drive of my vehicle. It cost me £5 and that you have to put it in one whole fuel tank load. This item cost me about £25...but im still using it! I must have used it in more than 5 tank loads already and ive still got more than half of it left! I can use this liquid for at least 20 full tank loads! Guess what? My vehicle now flies! This is an excellent liquid..ive been wasting my time on other well known makes which are absolutely useless!! Im very surprised that i have never heard of this make. Excellent cleaning power..comes in a very user friendly container which helps you use as little or as much as you want. Excelent..excellent excellent. !

So, I tried AR6900-D Max in a BMW 535d GT used on a regular 1353mile (2177km) trip through UK, France and Spain over 3days. Three tanks of diesel, 70ml added at first fill (70litre tank), and 50ml at next fill ups (50litres). TLDR: Didn't notice or measure any difference in fuel consumption or performance. This car usually returns between 37mpg to 39mpg doing motorway speed limits (70mph, 130km/h and 120km/h in each respective country). I was hoping to crack 40mpg which my old 530d GT could do (same size engine but with one turbo rather than two). Well, after 1353miles I was disappointed to see the trip computer (after reset at start of journey) showing 38mpg. This trip is with the same tyres and pressures, same filling stations, but at different time of year. It seems air temperature and headwinds make a bigger difference to mpg than this additive. To note, the engine is well serviced (oil changed every year) with BMW LL04 spec oil, now at 110000miles. Manifold/AGR (AGR = EGR in German) replaced several years ago due to soot build up jamming the swirl flaps, so intake should be relatively clean. DPF is intact with zero soot on exhaust tips (just light grey ash deposits). And the only running issue ever noticed was related to faulty glow plugs/controller making initial cold/winter starting a little lumpy/rough for a few seconds before settling at idle (now rectified). So it could be that as this engine is running perfectly fine, that the additive makes no difference compared to a car that may have underlying faults or running issues. I'll use it again on the return leg to finish off the bottles, just to confirm and edit if I notice changes. As a footnote this additive improves cetane value, which should help combustion. However if fuel quality is already optimal and engine condition is good then obviously it's not to going to make so much difference. It also smells exactly like the Eolys (176/ PATs/ powerflex) fluid that automatically adds fluid to the fuel on some 1.5/1.6 peugeot/citroen engines (and older Ford and volvo's with the same DV6/DV5 engine). So it's possible it contains similar ingredients and probably no use to you if you have a car with a functioning Eoyls system. Dosing is simple enough, but store it upright in an air tight ziplock bag, as if you know what Eoyls is like to smell/handle, this stuff is just as bad... nasty! 3 stars based on the fact it does contain ingredients that should help with combustion efficiency, but I couldn't validate any claims in real world use. Even at its discounted price of £11.96 for 500ml it equates to nearly 0.24p per litre of diesel or £1.67 per 70litre tank. And with no difference in fuel consumption, it actually increases the vehicle running costs. Edit: (16Dec2024) After a return leg of the same 1135mile journey, fuel consumption was actually slightly worse. But I've tried a few doses in a Seat Altea with the 130ps 2.0TDi PD (BKD) engine, which is used for local 20-30min commutes on mixed 30mph and 60mph roads and that appeared to be about 1mpg better. So again not really worth using.