This workshop service repair manual covers the Caterpillar CAT 6D16 DP Series diesel engines for all production years. These engines are known for their robust engineering and reliability, designed for demanding industrial applications. The manual specifically addresses various models within the 6D16 family, including the DP80, DP90, DP100, DP115, DP135, and DP150, providing comprehensive information for their maintenance and repair. This manual serves as an indispensable resource for both DIY mechanics and professional technicians. It details routine maintenance procedures, fluid capacities, and troubleshooting for common issues with easy-to-follow, step-by-step instructions and accompanying pictures. The English-language manual is printable and accessible for all users.