n this article prepared on behalf of Alef Grup, we present the features, advantages, and engine benefits of Mannol 10W-40 API SN/CN-4 engine oil in a clear and engaging manner. This versatile oil is developed for both gasoline and diesel engines, aiming to provide the level of protection required by modern engine technologies. Mannol 10W-40 API SN/CN-4 supports balanced lubrication across a wide range of temperatures thanks to its semi-synthetic formulation. By maintaining its fluidity in cold weather, it helps reduce friction that may occur during engine startup. As temperatures rise, the oil retains its structural integrity and forms a strong protective layer between engine surfaces. One of the most notable features of this product is its cleaning performance. Deposits that accumulate inside the engine over time can negatively impact not only performance but also fuel consumption and overall engine life. Mannol’s advanced additive packages help prevent the formation of these buildups, supporting a cleaner engine environment. A clean engine runs more smoothly, transfers power more efficiently to the road, and provides drivers with a more refined driving experience. Compliance with the API SN/CN-4 specification demonstrates that this oil meets the performance requirements of modern gasoline engines while also satisfying the needs of many diesel engines. This versatility allows the oil to appeal to a broad range of users and makes it a reliable option that Alef Grup can confidently recommend for different vehicle types. The long-lasting stability of Mannol 10W-40 helps ensure more efficient use of oil change intervals. Even under demanding conditions such as high temperatures, pressure, and heavy traffic, the oil maintains its protective properties. This contributes to extending engine life while keeping maintenance costs under control. Drivers benefit from the peace of mind that comes with using an oil that is both economical and highly protective.