In the pantheon of medium-duty trucks, the Mercedes-Benz 814 (part of the revered LN2 generation, produced from the mid-1980s to late 1990s) holds a legendary status. Famous for its robust OM366 engine and bulletproof drivetrain, these vehicles are still hard at work decades later as tippers, box trucks, and motorhome conversions. However, keeping a 30-year-old German thoroughbred on the road requires one indispensable tool: The genuine Service Repair Manual.