I have put it in an OPEL ASTRA 1600 DIESEL 2019 model. The engine has 105,000 km. The services are regular.
Oil of the same brand 5/30
I have driven 200 km since I put them in.
The sound of the timing chain changed.
Of the engine.
As a first impression ..

Very good, the engine sound changed, slight reduction in consumption, just for reassurance from an official reseller. Always following the instructions.

Very good product, I personally like it and use it. However, one should not expect miracles from engine additives. It's a bit like vitamins for people: the main thing is to have proper maintenance for the car. Ideally, also do a flush before changing the oil.

Cera Tec goes into the oil and helps the engine run a bit more smoothly and provides some extra protection. In my case, I noticed smoother operation. In my opinion, it doesn't do any harm, but neither does it perform miracles.

The product is top-notch.

The engine noise has been greatly reduced. On uphill roads, the car doesn't sound like it used to. And by touch, you can feel the quality of the product.

In new Motul 8100 oil I also added Ceratec, so far I have done 2900 km. Honestly, I haven't noticed any difference, neither in the engine sound nor in consumption. Anyway, I would give 1 star but I respect the company's name and its years of presence in the field.
Skoda Fabia 2009 1.4 naturally aspirated.

A thousand times liqui moly mos2, this actually worked for me, I had to do an immediate oil change, the engine was making a very loud noise, the timing chain

I installed it today. I will see how it works at the service after next. I gave it 5 stars for now; in about 6 months, if I see that it doesn't work properly as described, I will come back to change my review

After an engine flush and oil change on my Mercedes, I added 'ceratec'. All the noise and shaking that the engine had disappeared, and the sound is much cleaner and quieter. The car is more responsive when you press the gas; it does a very good job. But definitely, before you add it, you should have cleaned the engine with an engine flush, changed the oil and filter, and then add it. It works very well for those who know how to use it..

I put it in a Suzuki SX4 1.6L 107Hp with 113,000 km.
After very few kilometers, the engine noise was reduced.
After 300 km, the engine shows more agility, as well as torque at low revs.
First, I cleaned the engine with engine flush, and the Ceratec was added to new Motul 8100 5w40 (after they had done the first 100 km).
Very positive impressions so far.
4 stars and I promise to come back.

Edit 15/10/2025. After 3000 km, the above still applies. Fuel consumption has also decreased a bit.
I will return when I change oil.
Edit 10/4/2026.
The product gives its best after 4000-5000 km.
Now I have changed the oil and the car behaves better than new.
It's not suggestion, I know my car and the routes I take.
Quieter engine, better 'pull', slightly reduced fuel consumption.
So, 5 stars.
Recommended!

Something happens after 2500-3000 km and after 8000 km it's over; at first, the oil is like milk with cocoa, then it gradually disappears, eventually all of it will go to the oil filter and about 300 ml will be reduced from the sump, as another person wrote, it must have damaged the breather box and probably one of the lambda sensors, I would be missing it.

it's the only one I've used because it's economical! combined with oils from the same company having a vapor container I found all the anti-friction there! obviously, it doesn't stick to metals and other things they say so it's the most wasted money don't let them fool you not even 1 ml stays inside the engine doesn't accept it! I'm going to motorkote or super dynamic

I tried it on an Opel Corsa 06', the truth is I didn't see any crazy difference, a little better consumption and a slightly softer noise.

Used in Astra diesel. I didn't notice any sound difference nor in performance. That doesn't mean it doesn't do its job....
I give it 4 stars because it has a reputable name with only quality products.

I installed it in a 2008 clk 200 that I bought from a retiree and the car had been babied. Along with this, I put in oil from the same company 5/40. After 8000 km, conclusions: I check the engine at the traffic lights to see if it has turned off, it raises temperature more slowly, very little difference in consumption.

I installed it in a BMW N53 engine, known for its behavior with oils and leaks. From the very first drive after application, I haven't smelled burnt oil again no matter how much I pushed the car on the road, while in the past 4/5 times when I returned home, I smelled burnt oil from the engine with the oils recommended by the manufacturer (Castrol 5w30).

It's still early, I've only done 100km, the product requires about 800-1000km to take full effect. I will come back in the future!

I used it in an Octavia 20vt, right after I changed the oil. I use synthetic oil 5w40 and after 6000 km it has a consumption of about 800 gr. Exactly the same consumption it had without the addition of ceratec. I must be honest, I did not notice a difference in the sound of the engine but there was a difference in gasoline consumption as it decreased even if just a little.

Top add-on, you immediately see the difference when you start the engine, smooth operation. Perfect!!

If the car doesn't use good oil, you will see a difference and you really need it. In the case we are talking about a car with good oil and you want it for extra protection, you might need to go for superdynamic

In combination with Motul 5w40 in a multijet 1.3, it really calmed the car down. I recommend it UNRESERVEDLY. I also put it in a 1000cc three-cylinder atmospheric C1 for fun, and indeed it uses less oil (well-known engines that consume oil)

It indeed does what it says. I will use it again. The engine noise has decreased, while it seems to have gained a bit of power, e.g., on uphill climbs. It has improved how much temperature it raises when under strain (on a mountain ascent, it exceeded 92). (The results are noticeable after several kilometers when it starts to mix well with the oil). It was used in a car from 2000.

In GOLF TSI (2007) that I put (120ml) in the gearbox with a change of lubricants, I saw a big difference in the 1-2 shift that I had an issue with and overall good performance.
In KIA PICANTO (2005) that I put (180ml) in the engine with an oil change, after first doing an engine flush, I didn't notice any significant difference. Now, whether something will change in the long run, I don't know because I haven't driven many kilometers. I will come back if I see improvement, mainly in the noise, because I don't expect miracles in fuel consumption.

I have used it in 2 vehicles, a 1999 Passat 1.6, and a 2000 Yaris 1000cc. In both vehicles, I combined it with Motul 5-40 oil. In both vehicles, I saw a difference, I don't know if it is due to the oil that I changed from Aral 5-40 to Motul 5-40, I don't think so because I have used Motul in the past without this difference. The Motul oil combined with Ceratec does the job. It may be small, but it makes a difference, I feel it both in acceleration and in reducing consumption.

The best thing about it is that it has been tested on an Opel Astra K Diesel and it reduces consumption. It's not particularly noticeable, but the engine is calmer and smoother. If it really does have this coating and reduces friction, only time will tell.

I have installed it in a 1.4 TSI 150HP Turbo car with 150,000 kilometers and it seems to work very well even under pressure conditions. Time will tell.

So far, having done more than 800 kilometers, the only difference seems to be that the engine sound has softened slightly. I have not noticed any differences in fuel consumption.

edit (07/2024): The mileage now is 8000 with cera tec. No issues so far. The previous evaluation remains valid. No significant changes for better or worse were observed. In the 15 years I have had the car, without cera tec, it had the same mechanical behavior.
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Only 1000 km have been done with the product installed, so 3 stars ('good') for now.
The engine startup has improved slightly, it catches a bit easier and the chain noise is less audible, probably because it was lubricated more.
The overall sound of the engine remains the same. Some noise from the valves that used to hit (slightly) has decreased in intensity.
As for consumption issues, I didn't notice any improvements or worsenings in oil or gasoline.
I hope to remember and come back when I have done 7-8000 km with cera tec, and later on with more kilometers.
For now, 3 stars not because it's not good, but because it needs some kilometers and time to show if it really delivers what it promises.

I don't know about some people who have positive reviews on how this "thing" worked. I put it in my car as a preventive measure, without having any problems. Occasionally, every 2 oil changes, I would use motorkote and I was very satisfied. I simply tried it because of the positive reviews and because motorkote was priced very high...
Unfortunately, I regretted it as soon as I put it in the oil (after an oil change with Castrol magnetic 10w40, which I always use). The idle of the car became unstable to the point that when I stop the car, it stalls 7 out of 10 times, while when it's cold, it revs up to 2000 RPM at idle..(!!!)
I also noticed that at a steady speed, the car jerks...
Overall, I don't know how to get rid of this thing, and if it has caused damage instead of being good for the car, I definitely do not recommend it and there is no chance I will buy it again!!!

I added it in September to the oil for a Fiat Punto which burns oil in general, and by December everything had run out, almost burned it...

It worked after 3-4K km. The engine sound is the same. What changed is that the vibrations from the struts decreased in intensity. I have not noticed any difference in oil or gasoline consumption.

I put it in fresh oils in a WV 1.4 TSi CAVD engine from 2009 with 120,000 km in November 2023. The engine is well-maintained and in good working condition, with a recent upgrade to the timing system for those who know this particular engine. I took a three-day trip of 1500 km. Besides the sound of the engine working smoother, I also noticed a noticeable improvement in fuel efficiency, which went from 7.5-8 liters per 100 km to 6.5 liters per 100 km on the same trips in the past. I haven't reached the 5000 km mark yet, which is when the material is supposed to start performing and the fuel economy is noticeable. I also got it for my motorcycle (which has a dry clutch BMWR1200R) but I haven't ridden many kilometers yet, and for the farmer, a 2005 NAVARA. I highly recommend it and I will give it 5 stars.