Maintaining the longevity and performance of a classic 1980 Mercedes-Benz 450SLC requires more than just adding fluid; it demands the precise application of lubricants engineered for high-mileage European engineering. The 4.5-liter inline-eight engine, identified by the code 117.968 F, was a masterpiece of its era, designed to deliver smooth power and durability. However, the tolerances of this aging powertrain are best preserved by modern synthetic technologies that offer superior protection against wear, oxidation, and extreme thermal stress. Using the correct viscosity and type of AMSOIL 5W-40 FS 100% Synthetic European Motor Oil or AMSOIL 0W-40 FS 100% Synthetic European Motor Oil ensures that critical components remain lubricated even under the varying conditions of today’s driving environments.
Recommended AMSOIL Products
- AMSOIL 5W-40 FS 100% Synthetic European Motor Oil – A specialized formula designed for the unique demands of European vehicles, featuring a precise blend of synthetic base oils and premium additives to protect high-performance engines in all temperatures.
- AMSOIL 0W-40 FS 100% Synthetic European Motor Oil – Provides exceptional cold-start protection and high-temperature stability, ideal for owners seeking maximum film strength for their Mercedes-Benz engine across a wide range of climates.
- MANN-FILTERS Oil Filter – Offers premium filtration media that improves upon original equipment standards, ensuring contaminants are trapped efficiently to keep the engine oil clean and flow unrestricted.
- AMSOIL Passenger Car & Light Truck Antifreeze & Coolant – A unique 50/50 pre-mix formulation that provides protection up to 150,000 miles or five years, safeguarding all cooling system metals, gaskets, and hoses from corrosion and freezing.
- AMSOIL Propylene Glycol Antifreeze and Engine Coolant – A concentrated alternative that greatly surpasses industry standards for corrosion protection, allowing you to mix with distilled water for a highly effective cooling solution for vintage radiators.
- AMSOIL Signature Series Multi-Vehicle 100% Synthetic Automatic Transmission Fluid – Withstands the rigors of heavy towing and elevated temperatures, remaining fluid in sub-zero conditions to ensure smooth, shudder-free shifts in the 3-speed automatic transmission.
- AMSOIL OE Multi-Vehicle 100% Synthetic Automatic Transmission Fluid – A high-performance fluid engineered to protect against wear and sludge while promoting smooth operation and excellent cold-weather performance for classic automatic transmissions.
- AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid – Delivers excellent ABS and traction-control responsiveness with a stable viscosity over a wide temperature range, meeting Mercedes-Benz specifications for safe and reliable braking performance.
- AMSOIL 100% Synthetic Multi-Vehicle Power Steering Fluid – Reduces friction and helps seals remain soft to prevent leaks, offering strong anti-wear protection and quiet operation to ensure precise steering control in your 450SLC.
The 4.5-liter engine in the 1980 Mercedes-Benz 450SLC is a significant component that benefits greatly from synthetic lubrication. With a capacity of 8.8 quarts including the MANN-FILTERS Oil Filter, the oil change process is straightforward but critical for engine health. Owners should note that on models equipped with an oil cooler, additional oil may be required if the cooler is drained. After refilling, it is essential to allow the engine five minutes to settle before checking the oil level to ensure accuracy. The drain plug should be torqued to 30 ft/lbs to prevent leaks without damaging the threads. For the cooling system, the radiator holds 15.9 quarts, making it vital to use a AMSOIL Passenger Car & Light Truck Antifreeze & Coolant that prevents rust and corrosion in older aluminum and copper components.
Beyond the engine, the automatic transmission requires specific attention. For the 3-speed 722.0 transmission, a total fill requires 9.4 quarts, while an initial fill calls for 6.6 quarts. Whether you choose the AMSOIL Signature Series Multi-Vehicle 100% Synthetic Automatic Transmission Fluid for maximum durability or the AMSOIL OE Multi-Vehicle 100% Synthetic Automatic Transmission Fluid for excellent value, maintaining this fluid ensures smooth gear engagement and protects against wear in an aging unit. The rear differential holds a smaller quantity, requiring approximately 2.7 pints of lubricant to keep gears turning smoothly. For the braking system, the vehicle recommends DOT 4 Plus specifications, making a high-quality AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid the best choice for maintaining a firm pedal feel. The power steering system also benefits from a dedicated AMSOIL 100% Synthetic Multi-Vehicle Power Steering Fluid designed to handle the pressure demands of the steering pump and rack.
Proper maintenance also involves seasonal considerations. For owners who store their 450SLC during colder months, using a AMSOIL Gasoline Stabilizer helps keep fuel fresh for up to 12 months, protecting against varnish and gum buildup. An AMSOIL Engine Fogging Oil can be used to coat internal components, preventing rust during long periods of inactivity. For those who prefer to run their vehicles frequently, an additive like P.i. AMSOIL P.i. Performance Improver Gasoline Additive can help restore horsepower and clean fuel injectors, ensuring the engine runs as efficiently as it did when it rolled off the assembly line. Regular maintenance with these high-quality fluids not only preserves the vehicle’s value but also enhances the driving experience, ensuring that every journey in this classic coupe remains smooth and reliable.
About the Vehicle
The 1980 Mercedes-Benz 450SLC represents the pinnacle of the W107 series, a line of grand touring coupes that blended luxury, performance, and distinctive styling. Introduced in 1971, this generation of the 450SLC was the first to utilize the 4.5-liter V8 engine, which became the heart of the model until its production ended in 1981. The 4.5-liter inline-eight configuration is particularly renowned for its smooth power delivery and low-end torque, characteristics that made the car a favorite among enthusiasts and daily drivers alike. The 450SLC, as the coupe version of the 450SL convertible, offered a more rigid chassis and a sleeker profile, appealing to those who preferred a closed-roof luxury experience.
This era of Mercedes-Benz was known for its robust build quality and timeless design, features that have kept these vehicles relevant in the collector market today. The 1980 model year specifically benefited from the mature engineering of the 117.968 F engine code, which was celebrated for its durability and ability to withstand high mileage when properly maintained. The vehicle’s design emphasized comfort for long-distance touring, making it an ideal road companion for cross-country trips. Its reputation for reliability, combined with the classic aesthetics of the era, makes the 450SLC a highly sought-after classic among automotive aficionados who appreciate the blend of German engineering and grand touring elegance.