The Caterpillar C13 engine is a 13.0-liter, inline 6-cylinder, turbocharged diesel engine widely used in heavy-duty applications such as trucks, construction equipment, and industrial machinery. Known for its durability and fuel efficiency, the C13 is part of Caterpillar’s ACERT (Advanced Combustion Emissions Reduction Technology) engine series, designed to meet stringent emissions standards while maintaining high performance.