Diesel cars are vehicles powered by diesel engines, which use diesel fuel to operate. These engines are known for their efficiency and durability, often providing better fuel economy compared to gasoline engines. Diesel cars are popular for long-distance driving due to their ability to cover more miles on a single tank of fuel. In addition to fuel efficiency, diesel engines typically produce more torque, making them suitable for heavy-duty applications like trucks and SUVs. However, diesel cars can emit higher levels of certain pollutants, leading to environmental concerns. As a result, many countries are implementing stricter regulations on diesel vehicle emissions.