Mercedes-Benz Automotive Repair Manual Model 280 1977-1981 - 123 Series Author:John Haynes All models, 6-cyl gasoline engine (77 - 81) Haynes offers the best coverage for cars, trucks, vans and SUVs in the market today. Each manual is written and photographed from "hands-on" experience gained by a complete teardown and rebuild of the vehicle. The first Haynes manual was written this way 40 years ago, and all the manuals continue to... more » be produced this way, making Haynes the world leader in automotive repair information.« less