2001 Peterbilt 378 Sleeper, C-10 Caterpillar Engine, 12-Speed Transmission, Clean and Good Shape. Runs and drives great. Clean History. The C10 CAT engine is a 10.3L engine which has remained a popular choice since its production. The Caterpillar C10 engine made its first appearance in 1995 and continued to work in numerous environments and applications. The C10 CAT provides operators with both brilliant performance and efficiency.