The 2018 Mercedes-Benz GLE350 is a sophisticated luxury crossover that pairs German engineering with a robust 3.5-liter V6 engine. To maintain its performance and longevity, it is crucial to use lubricants designed specifically for the precise tolerances and thermal demands of European vehicles. Standard conventional oils or fluids not formulated for these requirements can lead to premature wear, reduced fuel economy, and potential costly repairs. AMSOIL synthetic lubricants are engineered to exceed the rigorous standards set by Mercedes-Benz, offering superior protection against the high heat and stress encountered during city driving, highway cruising, and towing.
Recommended AMSOIL Products
- AMSOIL 5W-40 FS 100% Synthetic European Motor Oil – This oil is designed for the unique demands of European gasoline vehicles, featuring a precise blend of synthetic base oils and premium additives to protect the 3.5L engine across all temperatures.
- AMSOIL 0W-40 FS 100% Synthetic European Motor Oil – An excellent all-temperature option that flows quickly at startup and provides a robust lubricating film at operating temperatures for the GLE350’s V6 engine.
- WIX Oil Filter – This premium filter uses advanced media to capture contaminants more effectively than standard OEM-branded filters, ensuring clean oil circulates through the engine for maximum component life.
- AMSOIL Passenger Car & Light Truck Antifreeze & Coolant – A unique poly-organic acid formulation that provides extended protection up to 150,000 miles or 5 years, safeguarding all cooling system metals and preventing corrosion.
- AMSOIL Propylene Glycol Antifreeze and Engine Coolant – A concentrated option that requires mixing with distilled water, offering industry-leading protection up to 150,000 miles or 5 years with excellent thermal conductivity and freeze point protection.
- AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – Formulated to withstand heavy towing, elevated temperatures, and challenging terrain while remaining fluid in sub-zero conditions for the 7-speed automatic transmission.
- AMSOIL OE Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – Provides protection against wear and heat for those seeking a fuel-efficient synthetic alternative that meets the stringent requirements of the GLE350 transmission.
- AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid – Offers excellent ABS and traction-control responsiveness with a stable viscosity over a wide temperature range, ensuring consistent braking performance in any weather.
Ensuring the correct fluid capacity is just as important as selecting the right product. For the engine, the total capacity with a filter change is 7.4 quarts. When performing a fluid service, it is essential to torque the oil drain plug to 22 ft/lbs if the plug is metal. Owners should always check the oil level after refill to ensure the correct amount is used. The cooling system requires specific attention as well; the High Temperature Coolant System (HTCC) holds 11.1 quarts, while the Low Temperature Coolant System (LTCC) holds 2 quarts. Using the correct mixture and type prevents overheating and extends the life of the radiator and hoses.
Transmission service is another critical area where synthetic fluids outperform conventional options. The 7-speed 722.9 transmission requires a total fill of 9.5 quarts. It is important to note that there are variations based on the vehicle’s datacard code. For models without the reduced-friction code A89, the fluid is typically 722.9….SL057. For those with the A89 code, the specification is 722.9….SL058. While both variants benefit from synthetic protection, the specific fluid selection ensures compatibility with the transmission’s internal friction modifiers. The differential and transfer case also require careful lubrication, with specific attention to the front differential capacity of 1.7 pints, ensuring all moving parts are shielded from wear and metal-to-metal contact.
Why Proper Lubrication Matters for the GLE350
The Mercedes-Benz GLE350 was designed with performance and comfort in mind, but modern European engines operate under extreme conditions that conventional oils cannot handle. The 3.5L V6 engine (Code 276.955) is a high-output powerplant that generates significant heat. When oil breaks down due to high temperatures or shear stress, the protective film between moving metal parts thins, leading to increased friction and accelerated engine wear. AMSOIL synthetic motor oils maintain their viscosity and protective properties even under these severe conditions, preventing sludge formation and deposit buildup that can clog critical engine passages.
Furthermore, the transmission system in the GLE350 is complex, relying on precise fluid dynamics to shift gears smoothly and efficiently. Conventional transmission fluids can degrade over time, leading to sluggish shifting, heat soak, and potential failure. By using AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid, owners can experience smoother shifts and reduced operating temperatures. This is particularly beneficial if the vehicle is used for towing or carrying heavy loads, as the fluid remains stable and does not break down as quickly as traditional alternatives. Alternatively, AMSOIL OE Fuel-Efficient 100% Synthetic Automatic Transmission Fluid provides reliable protection against wear and heat for those seeking a fuel-efficient synthetic alternative.
Brake systems in luxury vehicles like the GLE350 also demand high-performance fluids. The GLE350 utilizes ABS and traction control systems that rely on consistent brake fluid properties. AMSOIL DOT 3 and DOT 4 Synthetic Brake Fluid offers a stable viscosity across a wide temperature range, ensuring that the hydraulic system responds instantly when the pedal is pressed. This stability prevents vapor lock in extreme heat and maintains sensitivity in freezing conditions, providing superior safety and control.
Additional Protection with Fuel Additives and Care
Maintaining the fuel system of the GLE350 is another key aspect of ownership. Direct Injection (GDI) engines, which are common in modern Mercedes models, are prone to carbon buildup on intake valves and injectors. AMSOIL P.i.® Performance Improver Gasoline Additive helps restore up to 14% horsepower and returns GDI fuel injectors to 100% flow rate after just one tank of fuel. This additive not only improves fuel economy but also reduces the need for higher-octane fuel and helps prevent pre-ignition knock. For vehicles that sit for extended periods, such as seasonal storage, AMSOIL Gasoline Stabilizer can keep fuel fresh for up to 12 months, protecting against varnish and gum buildup. Additionally, the AMSOIL Upper Cylinder Lubricant Corrosion Inhibitor lubricates the fuel system and upper cylinders, compatible with capless fuel systems.
Exterior and interior care also play a role in preserving the value of the vehicle. The GLE350’s sleek design benefits from products like the AMSOIL Exterior Ceramic Spray, which sheds water rapidly and protects against UV rays without requiring cure time. Inside the cabin, the AMSOIL Interior Detailer – Light Lemon or AMSOIL Interior Detailer – Scent Free traps and eliminates odors while providing UV protection for surfaces. For cleaning tasks, the AMSOIL Engine Degreaser provides a professional-strength formula to remove tough grease from engine surfaces, while the AMSOIL Brake and Parts Cleaner ensures that brake components are free of contaminants without leaving residue that could cause squeal. For exterior cleaning, the AMSOIL Miracle Wash Waterless Wash and Wax Spray leaves vehicles with a fantastic shine. To protect the paint and undercoat, the AMSOIL Silicone Spray or AMSOIL Heavy-Duty Metal Protector can be used.
About the 2018 Mercedes-Benz GLE350
The 2018 Mercedes-Benz GLE350 represents a pinnacle of luxury SUV engineering, serving as the successor to the popular M-Class lineup. This model year vehicle was built on the W166 platform, which was known for its robust construction and blend of utility with high-end refinement. The GLE350 is powered by the M276 DE35, a 3.5-liter V6 engine that delivers smooth, linear power. This naturally aspirated engine produces approximately 302 horsepower, providing a driving experience that is both spirited and refined. The vehicle comes equipped with a 7-speed automatic transmission featuring the 4MATIC permanent all-wheel-drive system, ensuring excellent traction in various road conditions, from city streets to winding mountain roads.
Owners of the GLE350 appreciate its spacious interior and high-quality materials, which are hallmarks of the Mercedes brand. The vehicle offers a commanding driving position and advanced technology features that enhance comfort and safety. As a luxury crossover, it bridges the gap between a passenger car and a rugged off-roader, making it versatile for daily commuting as well as weekend adventures. The 2018 model year sits comfortably within a generation that was praised for its build quality and sophisticated design language.
Despite its reliability, the GLE350 does have some known issues that owners and mechanics often discuss. One common area of concern involves the high-pressure fuel pump (HPFP), which can fail prematurely, leading to rough idling or engine stalling. Another frequent problem involves the air suspension system, which is standard on many models and can develop air leaks in the struts or valves over time, causing the vehicle to sit unevenly. Additionally, some owners have reported issues with the secondary air pump, which is part of the emissions control system and can fail, triggering a check engine light. A fourth issue often cited is the water pump assembly, which may leak or fail, requiring replacement to prevent coolant loss and potential engine overheating.
Using high-performance synthetic lubricants can help mitigate the impact of these common problems and extend the service life of the vehicle. For instance, the extreme thermal stability of AMSOIL motor oils can help protect the high-pressure fuel pump and engine bearings from the stress of frequent stop-and-go traffic. The superior wear protection in the synthetic transmission fluid can help maintain the smooth operation of the 4MATIC system’s transfer case and drive shafts. Additionally, the corrosion inhibition properties of the antifreeze and coolant can help protect the cooling system, reducing the risk of leaks and overheating associated with water pump failures. By staying on top of maintenance with premium fluids, owners can keep their GLE350 running smoothly for many miles to come, ensuring that the vehicle remains a reliable and enjoyable part of their daily life.