The 2018 Mercedes-Benz CLA45 AMG is a high-performance compact sports sedan powered by the formidable 2.0-liter M133 turbocharged engine. This powerplant, identified by engine code 133.980.1, demands a level of lubrication quality that goes far beyond standard manufacturer recommendations. The engine operates under intense thermal and mechanical stress, particularly when pushed to its performance limits in aggressive driving conditions. Using the correct synthetic motor oil is not just a maintenance recommendation; it is a necessity to ensure the longevity of the turbocharger, maintain precise oil control, and prevent the deposit formation that can plague high-strung European engines. Proper lubrication protects critical internal components, ensuring the vehicle delivers the expected horsepower and torque while maintaining optimal efficiency over extended service intervals.
Recommended AMSOIL Products
- AMSOIL 5W-40 FS 100% Synthetic European Motor Oil – Engineered specifically for the unique demands of gasoline, diesel, and hybrid European vehicles, this oil features a precise blend of synthetic base oils and premium additives that meet the rigorous standards required by the CLA45 AMG’s engine.
- AMSOIL 0W-40 FS 100% Synthetic European Motor Oil – This versatile grade offers superior protection in all temperatures, providing excellent flow during cold starts while maintaining a robust protective film at high operating temperatures, ideal for the 2.0L turbocharged engine.
- AMSOIL Passenger Car & Light Truck Antifreeze & Coolant – A 50/50 ethylene glycol pre-mix formulation that protects cooling system metals, gaskets, and hoses, offering up to 150,000 miles or five years of protection for the vehicle’s cooling system.
- AMSOIL Propylene Glycol Antifreeze and Engine Coolant – A concentrated coolant option that delivers extended service life up to 150,000 miles or five years, providing superior corrosion and erosion protection for all cooling system components.
- AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid – Formulated to provide excellent ABS and traction-control responsiveness with a stable viscosity across a wide temperature range, ensuring safe and reliable braking performance.
When performing a maintenance service on this high-performance vehicle, capacity and specific fluid types are critical. The engine oil capacity is 5.8 quarts when replacing the oil filter. It is imperative to follow the recommended torque of 30 ft/lbs for the oil drain plug to prevent damage to the drain pan. The cooling system requires a capacity of 3.7 quarts for the LTCC (Long Term Coolant Check) and 7.8 quarts for the HTCC (High Temperature Coolant Check), depending on the specific configuration and method of fill. Brake fluid maintenance is also crucial, as the vehicle requires DOT 4 Plus or products approved on Mercedes-Benz Sheet 331.0 to maintain optimal hydraulic performance in the braking system.
Maintaining Performance Under Stress
The CLA45 AMG’s 2.0-liter engine is a marvel of modern engineering, utilizing a single-scroll turbocharger and high-flow fuel injectors to generate significant power. However, these performance attributes come with a cost: the engine runs hotter and under higher pressure than a standard naturally aspirated four-cylinder. Standard mineral oils or even conventional synthetic blends may struggle to maintain their viscosity and protective properties under these extreme conditions. The high temperatures can cause oil breakdown, leading to sludge formation, varnish deposits on turbocharger bearings, and increased wear on piston rings and cylinder walls.
AMSOIL synthetic motor oils are designed to withstand these specific challenges. The FS series motor oils for European vehicles utilize a chemically pure base stock that resists thermal oxidation and shearing better than conventional oils. This ensures that the oil maintains its viscosity grade even after thousands of miles of hard driving. The additive package is tailored to clean the engine internally, preventing carbon buildup on the intake valves—a common issue in direct injection engines. By using these specialized lubricants, you ensure that the engine’s tight tolerances remain protected, the turbocharger spins freely without deposit buildup, and the overall efficiency of the powertrain is preserved.
Comprehensive Fluid Maintenance
While engine oil is the heart of maintenance, a complete fluid service ensures that every system in the CLA45 AMG operates at peak efficiency. The cooling system is the vehicle’s lifeline, particularly for the turbocharged engine which relies heavily on heat dissipation. AMSOIL antifreeze and engine coolants offer superior protection against corrosion, rust, and erosion compared to standard coolants. The organic acid technology (OAT) formulation used in the Passenger Car & Light Truck Antifreeze is compatible with all system metals and prevents the formation of scale and deposits that can restrict coolant flow.
Braking systems in performance vehicles like the CLA45 AMG are subject to repeated high-energy stops, generating significant heat. Standard brake fluid is hygroscopic, meaning it absorbs moisture from the atmosphere over time. This moisture lowers the boiling point of the fluid, which can lead to brake fade under heavy use. AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid resists moisture absorption and maintains a high boiling point, ensuring consistent pedal feel and braking power. The fluid is compatible with ABS systems and provides a stable viscosity profile, ensuring reliable stopping power in both winter and summer driving conditions.
Although there are no specific filter recommendations listed for this engine in the current data, maintaining the oil system with a high-quality synthetic oil helps maximize the life of any filter installed. For seasonal storage, AMSOIL Gasoline Stabilizer can be used to keep fuel fresh for up to 12 months, preventing varnish and gum buildup in the fuel injectors and tank. If the vehicle will be sitting for an extended period, Engine Fogging Oil can protect internal components from rust. Additionally, AMSOIL P.i. Performance Improver can help restore horsepower and flow rate in fuel injectors, which is beneficial for maintaining the engine’s performance characteristics over time.
Regular maintenance also extends to the exterior and undercarriage of the vehicle. AMSOIL Synthetic Multi-Purpose Grease offers outstanding low-temperature pumpability and resistance to thermal degradation, making it suitable for various chassis points. For owners concerned about corrosion, especially in areas with salt or moisture, AMSOIL Heavy-Duty Metal Protector provides a long-lasting, wax-like coating that shields steel, aluminum, and other metals from the elements. Cleaning and care products like the Miracle Wash Waterless Wash and Wax Spray allow for easy maintenance of the vehicle’s finish without the harsh chemicals that can damage paint or trim.
About the Vehicle: The CLA45 AMG Legacy
The 2018 Mercedes-Benz CLA45 AMG represents the pinnacle of the compact performance segment, a vehicle that successfully blends the practicality of a four-door coupe with the aggressive spirit of a true AMG sports car. Introduced as the first model to wear the full “AMG” badge, the CLA45 AMG marked a significant shift in Mercedes-Benz’s strategy, bringing their high-performance engineering to a more accessible entry-level platform. The vehicle is built on the MFA2 platform, which provides a sturdy foundation for the 2.0-liter turbocharged engine to push out substantial power while maintaining agility and handling sharpness.
Owners of the CLA45 AMG are often drawn to the vehicle’s unique character: it is a daily drivable car that can surprise with its track-capable performance when the mode is switched to Sport+ or Race. The 2.0L engine, known for its robust head design, is capable of handling significant tuning potential, which has led to a vibrant aftermarket community. However, the factory engineering is already impressive, delivering rapid acceleration that rivals larger displacement engines from previous generations. The interior reflects the luxury one expects from the brand, featuring high-quality materials, supportive sports seats, and advanced technology displays, all wrapped in a sleek, aerodynamic exterior that stands out on the road.
Despite its impressive capabilities, the CLA45 AMG does have specific areas of concern that owners should be aware of, particularly as the vehicle ages. One of the most common issues reported with this model is the potential for high-pressure fuel pump failures, which can lead to hard starting or engine stalling. The engine’s direct injection system puts significant stress on the fuel pump, and using a high-quality gasoline additive like AMSOIL P.i. can help maintain injector cleanliness and reduce the load on the fuel system. Another prevalent issue is carbon buildup on the intake valves, a common characteristic of direct injection engines where fuel no longer washes over the valves to clean them. This buildup can restrict airflow and reduce performance over time.
Turbocharger wear and lag are also considerations for high-mileage examples of this vehicle. The small turbo is optimized for quick spool, but the bearings and housing can be sensitive to oil degradation. Consistent use of a high-temperature stable synthetic oil helps lubricate the turbocharger effectively, preventing premature wear and ensuring the boost pressure remains consistent. Additionally, owners have noted issues with the engine mounts, which can become brittle and fail over time, leading to increased vibration in the cabin. While this is a mechanical wear item, the use of high-quality synthetic fluids throughout the drivetrain can reduce stress on these mounts by smoothing out power delivery.
Finally, the electronic control systems and sensors, which manage the complex interplay between the turbo, transmission, and engine management, can occasionally suffer from electrical gremlins or sensor failures. A clean electrical environment and stable voltage, supported by a healthy battery and clean connectors, are essential. While not a direct fluid issue, keeping the engine compartment clean with products like AMSOIL Engine Degreaser can help prevent corrosive buildup that might affect sensors or connectors. By addressing these potential problem areas through rigorous maintenance and the use of premium synthetic lubricants, CLA45 AMG owners can ensure their vehicle continues to deliver the thrilling driving experience that made it a legend in the compact performance class.