This maintenance book is a valuable resource for owners of a GM Detroit Diesel Series 149 engine. It contains detailed information on how to keep the engine running smoothly and efficiently. The book was published in 1972 and is an original manual (6SE313). The brand is General Motors and the model year is 1972. The model is 149 and it is compatible with equipment made by Detroit Diesel. Whether you’re a professional mechanic or a DIY enthusiast, this book will help you get the most out of your engine.