In what type of engine is the C classification utilized?

The C classification is used in diesel engines, particularly in the context of engine lubricants and oils. This classification indicates that the oil meets certain performance standards for diesel machines, which operate under different conditions compared to gasoline or petrol engines. Diesel engines are known for their higher torque and tend to deal with higher pressures and temperatures, necessitating oils that can provide better protection and performance under these conditions. Therefore, oils with the C classification are specifically formulated to handle the rigorous demands of diesel engine operation, making them essential for ensuring optimal performance and longevity of the engine. This focus on the unique needs of diesel engines is what sets the C classification apart from classifications primarily meant for gasoline or petrol engines.