Proper lubrication is the lifeblood of your 1980 Mercedes-Benz 450SL. This classic vehicle, powered by the robust 4.5L inline-eight engine (Engine Code 117.968 F), relies on high-quality synthetic fluids to maintain smooth operation and long-term durability. Using the correct motor oil, transmission fluid, and coolants is essential for protecting this German engineering icon from wear, especially given its age and the specific demands of its design. AMSOIL synthetic lubricants are formulated to meet the precise needs of European vehicles, offering superior protection against extreme temperatures and extended service intervals.
Recommended AMSOIL Products
- AMSOIL 5W-40 FS 100% Synthetic European Motor Oil – A premium European formula designed for the specific demands of gasoline and diesel engines, featuring a precise blend of synthetic base oils and additives. Ideal for all operating temperatures, this oil ensures superior protection and flow.
- AMSOIL 0W-40 FS 100% Synthetic European Motor Oil – Another top-tier European-spec oil that provides exceptional cold-start protection and high-temperature stability. This viscosity is perfect for maintaining optimal oil pressure and reducing engine friction in the 450SL.
- MANN-FILTERS Oil Filter – Features premium filtration media that offers improvements over standard OEM-branded filters, ensuring that critical engine components remain free of contaminants during every oil change.
- AMSOIL Passenger Car & Light Truck Antifreeze & Coolant – A unique poly-organic acid (OAT) formulation that exceeds OEM requirements, providing protection up to 150,000 miles. This 50/50 pre-mix protects all cooling system metals, gaskets, and hoses from corrosion and cavitation.
- AMSOIL Propylene Glycol Antifreeze and Engine Coolant – A concentrated coolant option that provides extended protection, safeguarding your cooling system metals and gaskets against extreme temperatures.
- AMSOIL Signature Series Multi-Vehicle 100% Synthetic Automatic Transmission Fluid – Withstands the rigors of heavy towing, elevated temperatures, and challenging terrain while remaining fluid in sub-zero conditions. It provides reserve protection during heavy use, ensuring smooth shifts and extended transmission life.
- AMSOIL OE Multi-Vehicle 100% Synthetic Automatic Transmission Fluid – An excellent alternative that resists harmful sludge and promotes smooth, shudder-free shifts, protecting your transmission against wear.
- 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, essential for maintaining safe braking performance in this classic vehicle.
- AMSOIL 100% Synthetic Multi-Vehicle Power Steering Fluid – Reduces friction and helps seals remain soft to prevent leaks, while offering strong anti-wear protection and excellent high-temperature performance for quiet operation.
The 1980 Mercedes-Benz 450SL features a 4.5-liter inline-eight engine that requires a specific volume of lubricant to operate correctly. When performing an oil change, including the filter replacement, the engine requires 8.8 quarts of oil. It is important to note that on models equipped with an oil cooler, additional oil may be needed if the cooler is drained. After refilling the engine, owners should allow five minutes after refilling or turning the engine off before checking the oil level to ensure an accurate reading. For the transmission, which is a 3-speed automatic (722.0 series), the total fill capacity is 9.4 quarts, with an initial fill of 6.6 quarts. The cooling system holds 15.9 quarts, making the selection of a high-performance coolant vital for maintaining the engine’s thermal balance.
Beyond the engine and transmission, maintaining the other fluid systems is crucial for the vehicle’s overall health. For the brake system, the 450SL requires a DOT 4 plus fluid or a product approved on Mercedes-Benz Sheet 331.0, such as AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid. This fluid ensures that the braking system remains responsive even under heavy use or in varying weather conditions. The power steering system also benefits from AMSOIL’s synthetic multi-vehicle fluid, which resists heat and protects seals from hardening, a common issue in older vehicles.
For those who store their 450SL seasonally, AMSOIL offers protective additives to keep the fuel system fresh and the engine components lubricated during periods of inactivity. Products like AMSOIL Gasoline Stabilizer and Engine Fogging Oil are ideal for preventing rust and varnish buildup, ensuring that when the car is ready for the road again, it starts smoothly. Additionally, AMSOIL P.i. Performance Improver can be used to restore horsepower and clean fuel injectors, helping the engine run efficiently even after long periods of storage.
Vehicle Background and Driving Experience
The 1980 Mercedes-Benz 450SL represents a pinnacle of automotive engineering from the late 1970s and early 1980s. Part of the iconic R107 SL-Class, this model is renowned for its blend of luxury grand touring capability and robust performance. The 450SL is powered by the legendary M117 4.5-liter V8 engine, a unit celebrated for its smooth power delivery, durability, and distinctive sound. The R107 chassis, known for its longevity, features a strong safety cage and independent rear suspension that provided a comfortable yet engaging ride.
Owners of the 450SL often appreciate the vehicle’s timeless design, characterized by its elegant lines, pop-up headlights, and spacious, well-appointed interior. While it lacks the modern turbocharging or direct injection of today’s performance cars, the naturally aspirated V8 offers a linear and refined driving character that many enthusiasts still seek. The car was designed for both spirited driving on winding roads and comfortable long-distance cruising, a duality that continues to make it a favorite among collectors and drivers alike.
As a classic Mercedes-Benz, the 450SL requires careful maintenance to preserve its value and performance. The use of high-quality synthetic fluids helps mitigate the effects of age on seals and gaskets, while providing the necessary protection to keep the engine and transmission running as they did when new. By selecting the right AMSOIL products, owners can ensure that their 450SL remains a reliable and enjoyable vehicle for years to come, honoring its status as one of the finest grand tourers of its era.