The Mercedes-Benz 300E, part of the acclaimed W124 chassis generation produced from 1985 to 1995, represents a benchmark in executive sedan engineering. Renowned for its exceptional build quality, durability, and refined driving experience, the 300E offers a robust 3.0L inline-six engine delivering approximately 189 horsepower and 184 lb-ft of torque. This model is celebrated for its sophisticated Bosch K-Jetronic fuel injection system, advanced safety features for its era including optional ABS and pre-tensioning seatbelts, and a comfortable, well-appointed interior. The W124 platform itself is lauded for its superior aerodynamics, ride comfort, and longevity, making the 300E a highly regarded vehicle for both daily commuting and longer journeys. This comprehensive Service and Repair Manual provides detailed guidance for all 1986 Mercedes-Benz 300E models. Covering over 1000 pages of essential information, the manual is designed to assist professional mechanics, DIY enthusiasts, and average car owners in maintaining and repairing their vehicle. It includes in-depth procedures for engine diagnostics and overhaul, fuel and ignition systems, cooling, exhaust, transmission, drivetrain, suspension, steering, brakes, and the complete electrical system, complete with wiring schematics. Additionally, it offers step-by-step instructions for bodywork, interior repairs, and climate control systems, along with troubleshooting tips for common issues such as wiring harness degradation and potential head gasket leaks.