This comprehensive Mercedes 420 SEL service repair manual covers models produced between 1986 and 1991. It provides a wealth of information for anyone looking to repair, maintain, rebuild, refurbish, or restore their vehicle. This manual contains the same detailed information used by professional technicians and mechanics, guiding you through every step of the process with clarity and precision. Dive deep into the world of your Mercedes 420 SEL with this manual's thorough coverage of all major components and systems. You'll find detailed step-by-step instructions, accompanied by clear diagrams, illustrations, wiring schematics, and specifications. From routine maintenance tasks like oil changes and filter replacements to more complex procedures like engine adjustments, transmission repairs, and brake system inspections, you'll have access to the knowledge you need to tackle any job with confidence. The manual covers a broad range of topics, including: * **Engine:** Learn how to perform engine oil and filter changes, adjust valve clearance, check injection timing, replace fuel filters, and much more. * **Transmission:** Discover how to change transmission fluid and filters, check and adjust fluid levels, and understand the workings of both manual and automatic transmissions. * **Suspension and Steering:** Master the procedures for inspecting and maintaining your vehicle's suspension system, including self-leveling systems, shocks, struts, and axles. * **Brakes:** Explore the intricacies of your brake system, including how to inspect brake pads and disks, replace brake fluid, and adjust the parking brake. * **Electrical System:** Gain insights into the electrical components of your car, including how to check warning lights, diagnose issues, and troubleshoot electrical problems. * **Body and Interior:** Learn how to inspect and maintain your car's body, including the paint, door hinges, windows, lights, and interior components. * **Air Conditioning and Heating:** Understand the operation of your AC and heating system, including how to check refrigerant levels, replace filters, and troubleshoot common problems. This manual equips you with the knowledge and confidence to become your own mechanic, allowing you to keep your Mercedes 420 SEL running smoothly for years to come.

The Mercedes-Benz 420 SEL, produced from 1986 to 1991, is a luxurious and powerful sedan that embodies the pinnacle of German engineering and craftsmanship. It was part of the W126 series, known for its robust build quality, innovative technology, and timeless design. The 420 SEL was powered by a 4.2-liter, naturally aspirated, V8 engine, producing a respectable 215 horsepower and 243 lb-ft of torque. This engine was mated to a smooth and responsive 4-speed automatic transmission, providing effortless acceleration and a comfortable ride. The 420 SEL boasted a wealth of standard features, including power steering, power brakes, air conditioning, and a high-quality sound system. Inside, the cabin was a haven of luxury, featuring plush leather upholstery, wood trim, and a comprehensive instrument panel. The car's spacious interior provided ample comfort for both the driver and passengers, with ample legroom and headroom. The 420 SEL was renowned for its exceptional handling, thanks to its sophisticated suspension system and precise steering. On the road, it delivered a serene and stable ride, capable of handling both city streets and open highways with aplomb. The 420 SEL was the epitome of automotive luxury and refinement, a timeless classic that continues to be admired for its enduring elegance and performance.