This liquid with 27,000 reviews on Amazon promises to save gas and clean your engine.

Keeping your engine in good condition isn't just a matter of frequent visits to the shop. Many drivers , especially those with older vehicles, are looking for affordable solutions to extend their car's lifespan, reduce fuel consumption , or avoid unexpected visits to the mechanic.

Engine additives have gained popularity in this area. These liquids are added to oil to improve performance, remove impurities, and protect internal parts from wear . Although there is skepticism surrounding their promises, the truth is that some products have accumulated tens of thousands of positive reviews from users who claim to notice improvements from the first use.

One of them is Liqui Moly's Cera Tec , an additive with over 27,000 reviews on Amazon and a remarkable average rating. It sellsfor just €15 as a high-tech anti-wear protector that smooths engine operation and promises to reduce fuel consumption . The key? A blend of ceramic compounds and chemical modifiers that act directly on metal surfaces.

Cera Tec: the multifunctional additive

Cera Tec is presented as a multifunctional additive: on the one hand, it helps smooth out friction between the engine's moving parts, and on the other, it fills small metal irregularities with high-temperature-resistant ceramic particles. This, according to its manufacturer, contributes to a quieter engine, smoother driving, and reduced internal friction .

Many users add it to new oil at oil changes, although it can also be used between oil changes as long as there are at least 5,000 km left. It has a long-lasting effect of up to 50,000 km and is suitable for gasoline and diesel engines , as well as transmissions, pumps, and compressors. It is not compatible with wet clutch systems, but its versatility makes it a popular product for both new and older vehicles.

What's most striking is the variety of reviews that mention real improvements in fuel consumption, engine smoothness, and even noise reduction . While it's no substitute for a thorough mechanical checkup, it seems to serve as a useful complement for those looking to keep their car in top shape without spending too much.

Why resort to an additive like this?

The appeal of products like Cera Tec lies in their ease of use: you add it to the oil yourself , without any tools or technical knowledge. It's not a miracle solution, but it can be helpful if your car starts to show signs of wear or if you want to prevent future problems.

These types of additives aren't new, but the evolution of their composition (as in this case, with microfine ceramics and active chemical compounds) has increased their effectiveness. They don't just act as lubricants; they physically modify the engine's internal metal surfaces to reduce long-term friction. This translates into less heat, less wear, and, in theory, improved fuel efficiency .

Of course, Cera Tec isn't a magic potion for your car, but it's not a smokescreen either: it's a proven product, with years of development behind it, whose popularity doesn't seem accidental. Perhaps that's why it's become one of the best-selling additives on platforms like Amazon.