I put it in a 2001 CBR600F4i that had 1 of the 4 injectors clogged, and within 15 minutes it unclogged it, excellent

Personally, I didn't see any difference on a GSR600.
before, after, and during, it seemed exactly the same to me

In a Ford Focus with 190,000Km, as far as I understood, it did its job (one 300ml wurth container in 40 liters of petrol). Also, while it was in the tank, there was a slightly better engine performance.
On the negative side, the high price compared to the competition, that's why four stars.

It seems to do the job... it's definitely not psychological.. on a BMW 328i GT, with 98RON petrol, I got 3 bottles to use consecutively in 3 fill-ups.. from the first half tank, I can feel the difference... the throttle responds better, it's fuller. At 250+hp the difference is noticeable.

it definitely worked on a car with 220,000km (1.8 - 125hp) which surely had something "stuck" in the injection system.. I put it in a full tank (55lt). and as soon as I put it in I drove 160km. Two days later I did another 400km, all with steady throttle at 90-110.. This continuous supply of gasoline with the cleaner in the injectors for quite a few kilometers I imagine is what helped get the job done. 2 refuels after use I saw that consumption in the city decreased by >1.5lt/100, which means that the fuel is indeed being injected more properly now. In terms of performance I didn't see a difference since I drive like a 95-year-old without sudden accelerations/braking both in the city and outside

I always use such cleaners for my vehicles, once every 5 to 10 thousand kilometers. I usually do it after a service or a trip where I refueled at gas stations I don't know. After 150,000 kilometers when I went for injector cleaning, they found them to be barely dirty and the first question they asked me was if I use such cleaners. They confirmed to me that these cleaners work, and I was right to use them. If there are failures in the injectors, it will "hurt" my wallet. I should note here that in a 2000 VW group car, I PREVENTIVELY changed the fuel pump at 210,000 kilometers. The mechanic was "stunned" when I told him I still had the factory pump. As for this specific product, it works very well and there is a difference after using it, both in fuel consumption and performance. Recommended! P.S. I keep the 5th star for the Liqui Moly injection cleaner

I keep the car stationary for quite a while. When winter comes, I use it more, and every time I refuel, I also use this Wurth product. The car performs better and consumes less fuel. It reassures me that even though it is stationary, it 'protects' the car from the residues that form.

I can't say for sure that it did anything, nor did I see any difference. However, it may have done the job it was intended for internally.

Three pieces were purchased to be used in two cars and two motorcycles. Definitely the vehicles breathe better, specifically in one motorcycle it runs better and increases speed more comfortably.

Just pay attention to the proportions, the 300ml that the whole bottle contains correspond to 50 liters of fuel, so you should put a corresponding amount in smaller tanks or if you haven't filled it up.

I used it on an old Suzuki. I noticed a decrease in fuel consumption, smoother and quieter engine operation.

I recently used it preventively (1.5 months ago) on a 1993 Corolla xli 1.3 with 167,000km. The car had no issues except for some experiments that were probably due to the quality of the gasoline I used on trips. After using it, I noticed that the engine was running smoother and the experiments decreased. Even the noise became sweeter. Maybe the gasoline also played a part in the improvement. In Athens, I use EKO regular (economy) from a specific gas station called Kalypsi for years without any problems. I also bought the Wurth additive from this gas station for 10.5€. Conclusion: It seems to do what it says - it didn't do any harm! - I will use it in the future as well (I have also bought a second one)

I used it due to instability and vibrations at idle during cold start in a 2015 Audi A3. I poured the whole bottle into a half-full tank and immediately saw some improvement (I think Liqui Moly is better)

I installed it and from the first few kilometers, I noticed a difference in the engine's performance and especially in the idle, which used to be shaky. The car has 200,000 kilometers on it, and I bought it used. I don't think it has ever been cleaned internally before. I will use it every year from now on.

Noticeable decrease in fuel consumption, smoother and quieter engine operation. I didn't expect to see a difference, but there is and it's quite noticeable. I will be using it once a year from now on along with the car service.

I used it on an old Suzuki. The engine noise "sweetened", so it did something, but the consumption remained exactly the same. At least now it operates more cleanly and maybe it will live longer.

It definitely does the job it promises, I used it on my motorcycle for two consecutive tank fill-ups and it actually showed to clean as the noise from the fuel pump noticeably decreased. Later on, I also noticed a slight improvement in fuel economy - so obviously it did its job in the injection system as well. I will include it in my routine, it will be used once a year for preventive reasons!

It does what it promises, I personally saw a difference, of course it also depends on the problem and each person's vehicle