This comprehensive Mercedes 300SEL Service Repair Manual provides detailed instructions and guidance for servicing and repairing your vehicle, covering model years 1988 through 1991. The manual is designed to assist both professional mechanics and knowledgeable DIY enthusiasts in diagnosing and resolving a wide range of vehicle issues. The manual encompasses a wealth of information, including detailed instructions for inspecting component condition, checking and adjusting various systems, performing routine maintenance tasks, and addressing more complex repair procedures. The content covers a wide array of topics, from basic maintenance like engine oil and filter changes and tire rotations to more advanced procedures like transmission fluid and filter replacements, brake system inspections and adjustments, and steering system checks. You'll find detailed instructions on inspecting the condition of lines and hoses, suspension and body structure, water leakage and corrosion, and various components. The manual also guides you through the process of checking and adjusting valve clearance, idle speed, injection timing, and replacing filters such as the fuel filter, air filter, and coolant. The manual also contains valuable information on inspecting and lubricating throttle linkage, checking and adjusting idle speed adjustments, and inspecting and maintaining the self-leveling suspension system. You'll learn how to check and adjust fluid levels in various systems, including the front and rear axles, transfer case, clutch system, and power steering. The manual includes detailed instructions for inspecting and rotating wheels, checking tires, and correcting tire pressure. Furthermore, the manual covers comprehensive brake system maintenance, including checking brake fluid level, inspecting brake lines, inspecting brake pads and disk thickness, inspecting and cleaning brake disks, and adjusting the parking brake. You'll also find instructions for replacing brake fluid and performing a brake test. The manual includes guidance on maintaining the fuel system, exhaust system, battery, and electrical systems. You'll find detailed instructions for checking and correcting battery fluid level, inspecting warning and indicator lamps, cleaning water drains, removing and installing engine compartment lower panels, lubricating door hinges and locks, and cleaning the cassette deck tone head and antenna mast. Additionally, the manual covers inspection and maintenance of the vehicle's exterior, including headlamps, exterior lamps, windshield and headlamp wipers and washers, and the sunroof. It also provides instructions for replacing windshield wiper blades, checking and correcting AC refrigerant charge, replacing various filters such as the dust filter for heating and ventilation, active charcoal filter, and recirculating air filter, and lubricating the folding side mirrors and hood. Finally, you'll find guidance on inspecting safety belts, checking backrest lock operation, removing and installing lower noise encapsulation panels, and checking the body for paint damage. This Mercedes 300SEL Service Repair Manual is an invaluable resource for anyone who wants to keep their vehicle running smoothly and efficiently.

The Mercedes-Benz 300 SEL, produced from 1988 to 1991, represented the pinnacle of luxury and performance in the automotive world. This stately sedan, part of the W126 model series, was a testament to German engineering prowess, offering a sophisticated blend of comfort, power, and refinement. The 300 SEL was powered by a 3.0-liter, six-cylinder engine that delivered a smooth and potent 188 horsepower. This engine, coupled with a four-speed automatic transmission, allowed the 300 SEL to effortlessly glide through traffic with effortless acceleration and a quiet, refined demeanor. Beyond its performance, the 300 SEL exuded elegance. Its spacious and luxurious interior featured plush leather upholstery, wood trim, and a host of modern amenities. The spacious cabin provided ample room for five passengers, and a generous trunk offered ample cargo space. The 300 SEL was renowned for its safety features, including a reinforced passenger compartment, anti-lock brakes, and a driver's airbag. These features, combined with its sturdy construction and advanced suspension system, ensured a safe and comfortable ride. Although the 300 SEL was replaced by the W140 S-Class in 1991, it remains a highly sought-after classic car. Its timeless design, powerful engine, and luxurious amenities continue to capture the imagination of automotive enthusiasts worldwide. A Mercedes-Benz 300 SEL from this era is not just a car; it's a symbol of prestige, sophistication, and enduring quality. The 1988-1991 models offer a unique blend of classic elegance and modern engineering, making them desirable for collectors and drivers alike.