I put it in a Suzuki Burgman 200cc, I used it up over four fill-ups, and now the bike, with each fill-up, does almost 40 kilometers more and the engine has much more liveliness. The engine has 47 thousand kilometers without any repairs. Now I started putting it in the car too, but it's still early; it needs a little time to work, at least twice in two fill-ups it should be added.

I don't know what magic potions Liqui Moly puts in, but I know the product works.
I had shaking at idle and some hesitation at low revs without any obvious cause from damage to the car.
After applying the product and a high-rev trip, the shaking almost disappeared and the performance at low revs improved noticeably.
Obviously, it doesn't clean the deposits 100%, but it definitely improves the situation and it's useful to use it as an additive every few thousand kilometers.

I put it in as a precaution, at first the engine was acting up a bit, even the check engine light came on once... so I thought, ok, it's doing something... now I haven't noticed any significant difference... I hope it did some internal cleaning

Does what it says on the tin. Noticeable difference in a MAZDA EURO 3 1.8L engine after half a tank. I didn't dilute it in 50L but around half, about 30L of 100-octane gasoline.

I want to believe that it did what it says.
I couldn't see - verify it.
I used it on my Varadero.
I didn't see - notice any difference.
Maybe I will buy it again sometime.

Installed in a Suzuki SX4 1.6 from 2008 with 116,000km.
After burning about half the tank, the difference started to show.
Consumption decreased under the same conditions and the engine responded better.
The difference continued with the next fill-up, which did not contain the cleaner.
Keep in mind that ALL cleaners are not magic potions.
Simply, with these, we try to restore the engine to the condition it was in when new.
Edit 20/5/2026
It was used again in the next fill-up in April/2026 with the same excellent results.
Attention for owners with direct injection! It will NOT do anything, since in these engines the fuel is injected directly into the combustion chamber and does not pass through the intake manifold or intake valves. It may possibly clean residues only inside the combustion chamber.

I have used the above product twice in an X5 3.0i with an M54B30 engine and I have noticed up to a 2 liters/100 km difference in consumption on trips. An economical product that is worth mixing occasionally with gasoline for better engine performance. BEWARE of imitations!

I can't draw any substantial conclusion because I didn't see any improvement and perhaps it wasn't needed for my engine. It neither cries nor laughs.

I don't know how well it cleans the valves according to what it promises, but the difference in acceleration is more than obvious and there is immediacy in the throttle response. I put it in a Mazda 6 with 137K km and now that the tank is at 1/4, I have a different car, it wasn't even like this when it was new!

I used it in combination with the Injection Cleaner consecutively with 98-octane fuel in a 2004 Mazda3. The engine started running like new from the first 100km or so. Now it starts immediately without hesitation and its idle has dropped by 300 rpm. The difference in the engine's operation is huge.

I bought a used car with 200 thousand kilometers and the car was smoking. I added the valve cleaner and after about 1000 kilometers it stopped. It did a good job. I bought 3 pieces and I use them regularly

Car with 25 years behind it started to cough, after ultrasonic cleaning of the injection, I put in INJECTION CLEAN, after 2 refills of CATALYTIC SYSTEM CLEANER and now I put in VALVE CLEANER very good result thank you LIQUI MOLY

The "knocking" disappeared with the use of this particular additive.
Although the noise stopped with the first bottle-tank, I will complete 5 refills, which in other difficult cases, I have seen do an excellent job, cleaning the combustion chamber from deposits.
UPDATE:
After completing 5 refills (1/month) with this additive, the fuel hose that brings the fuel to the engine became a "fountain," even though it was less than 1 year old.
Unfortunately, if one looks into it, there is a general problem with the quality of these spare parts, as they do not meet the specifications. That’s why you should choose the best ones you can find.
However, I cannot help but attribute part of the problem to the cleaning fluid itself, as the spare part I used was not top quality, but 16 months had passed without an issue.

It was used for regular cleaning on an engine that has done 40,000 km twice. I didn't notice any difference, but I think it's expected given the engine's age. Besides, its use is preventive in my case

Very good product, it increases fuel economy, makes engine start easier, and improves overall performance

I don't think there is any difference between the cleaners. They are all the same. They all contain octane. They do the same job. You just need to know why you are buying it. If you think you are using it to have more horsepower, logically you have also bought it from Velopoulo

I have a 16-valve Renault Clio 98hp from 2003 with 210,000 km. I used the Motor Clean (Liqui Moly) before changing the oil and as soon as I put in the new oil, I also used the Motor Protect (Liqui Moly) and I couldn't believe how much better the car was running. So, I decided to try the Injection Cleaner from the same brand, and the car performed even better. Ten days ago, I also used the Valve Cleaner (Liqui Moly) and the car skyrocketed in performance. I don't remember it ever running this well, not even when it was new. It runs smoothly and accelerates effortlessly, without any strain on the engine. Today, I also used the Octane Booster with 98 Shell fuel to remove any residue from the cleaners, and I was amazed by the engine's performance. All the products from this company deliver exactly what they promise. I am incredibly satisfied!

Very good product. I combined it with a 98-page manual. The car sounds better at idle and doesn't shake like before. Once the tank is empty, I will return for further evaluation.

Very good in combination with the injection cleaner, the difference is immediately noticeable in the vehicle's response to gas and ignition.

The fuel tank (with 95 octane gasoline - for accuracy) was about halfway full when I filled it up and took a 3-hour trip due to obligations. Immediately, the difference in the engine was noticeable, with a better feeling on the gas pedal, which responded instantly, making me think that I had put in 98 octane gasoline. Refilling the tank completely for the return trip, I had the same impression from the engine, as mentioned above. I will use it again next time, as instructed, after 2000 kilometers.

So, on my 20-year-old Polo, after using the injection cleaner, I used the valve cleaner during the next full tank and I am fully satisfied because:
1. The engine is quiet, with a much smoother feeling as if the car is brand new.
2. The idle stopped trembling steadily at 1000/min.
3. And most importantly, the fuel efficiency with a full 45-liter tank was about 400 km. At the moment, I have driven 500 km and the reserve light still hasn't come on. And this is with the first product I used. So, it does what it promises.
Overall, all these products from the company are effective and value for money. Especially for older cars

2022: It has another spray if you want to clean the intake manifold, this is for mixing with fuel, not for air. I applied it as a precaution before a 350 km trip, I saw a slight decrease in gasoline consumption but I will have to see it in city driving hence the 3 stars.
2024: Tried it again on a trip, I noticed a slight increase in engine responsiveness from the middle of the tank and after, it performs better in city driving so 4 stars, I will definitely use it again. I add it when there is a little gasoline left and immediately after I go for a refill (trip) so that I am sure it has mixed thoroughly in the tank.

In use on an old BMW engine, the sound improved and a Lean Error that the brain wrote every now and then stopped. I didn't notice any tangible difference in power or consumption, but the engine runs better.

I put it in the gas station with a full tank, I didn't see any crazy difference to tell you the truth, except that at the beginning when I put it, it was a little quieter, but after 1 month it was back to how it was before. I have seen videos on YouTube that it works, but because my car is old, it may need more

It does the job and there is also a small economy in fuel. With two bottles, you will see better results.

I bought the Liqui Moly Valve Cleaner 150ml (a) and the Liqui Moly Fuel Injection Cleaner 300ml (b) in Nov/2021. I used both, each separately in two consecutive fillings. The car is small and tired, a 12-year-old Daihatsu Cuore with 210,000Km. I noticed two significant improvements, which still remain after 2 months:

1) The idle function was completely fixed. Before, many times when I was at idle, either with a cold engine or a warm one, it would shake and the RPM would fluctuate from around 600 to 1300. Now it's perfect! The idle is always stable (at RPMs depending on whether the engine is cold or warm), it doesn't play around, and the RPMs don't fluctuate!

2) The engine now starts immediately! Before, you had to hold the key a little longer to start, for the past two months or so. It would start like a brand new engine. Even with very cold weather now in winter, it starts right away!

In the end, I think the additives I used did a very good job! I give them 5 stars!

I used it in one fill-up and in the next fill-up I used the Moly injection cleaner again. I have the swift sport 125 hp. In conclusion, the car did not have any issues, its performance improved somewhat, while fuel consumption increased for some reason (perhaps due to clean injectors, now that the residues are gone, they spray more fuel).

Amazing thing, I use it on my Alfa Romeo and it makes a noticeable difference even to someone who doesn't know their car.