Proper lubrication is the backbone of reliability for the 2016 Mercedes-Benz GL450, particularly with its sophisticated 3.0L twin-turbo V6 engine. This vehicle demands fluids that can handle high thermal loads, frequent stop-and-go city driving, and the unique requirements of European engineering. Using the correct synthetic oils and fluids ensures that the turbocharger remains cool, the transmission shifts smoothly, and the engine achieves its maximum potential for power and efficiency. This guide details the specific lubrication requirements and top-tier AMSOIL product recommendations to keep your GL450 running in peak condition.
Recommended AMSOIL Products
For the 2016 Mercedes-Benz GL450, AMSOIL provides specialized European-grade motor oils designed to meet the strict manufacturer specifications. These oils offer superior protection against high temperatures and engine wear compared to standard oils.
- AMSOIL 5W-40 FS 100% Synthetic European Motor Oil – A precise blend of synthetic base oils and premium additives designed specifically for the unique demands of gasoline, diesel, and hybrid European vehicles, offering extended drain intervals and superior protection for the 3.0L twin-turbo engine.
- AMSOIL 0W-40 FS 100% Synthetic European Motor Oil – An ultra-performance fluid that flows quickly to critical engine components in extreme cold while maintaining stability at high operating temperatures, ideal for year-round protection in this luxury SUV.
- WIX Oil Filter – This premium filter features advanced media that offers improvements over original equipment manufacturer-branded filters, trapping more contaminants to ensure clean oil circulation for your Mercedes-Benz engine.
- AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – Formulated to withstand the rigors of heavy towing, elevated temperatures, and challenging terrain, this fluid ensures smooth shifts and extends transmission life for the 7-speed automatic unit.
- AMSOIL OE Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – A high-quality alternative that provides essential protection against wear for the automatic transmission, balancing performance and value for the GL450.
- AMSOIL Passenger Car & Light Truck Antifreeze & Coolant – A unique poly-organic acid formulation that is phosphate-free and protected against corrosion for up to 150,000 miles or 5 years, ensuring the cooling system operates efficiently in all weather conditions.
- AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid – Designed to provide excellent ABS and traction-control responsiveness with stable viscosity over a wide temperature range, keeping your braking system reliable and safe.
- AMSOIL P.i.® Performance Improver – A powerful gasoline additive that restores up to 14% horsepower by cleaning GDI fuel injectors and preventing carbon buildup, helping your turbo engine breathe better and run more efficiently.
The 3.0L engine in your GL450 is a marvel of modern engineering, utilizing direct injection and twin turbos to deliver significant power while maintaining fuel economy. However, turbocharged engines generate intense heat that can degrade conventional oils rapidly. AMSOIL European motor oils are engineered with additive packages that resist thermal breakdown and shear, ensuring that the oil film remains intact under the heavy load of the turbocharger. This is crucial for preventing sludge formation and protecting the timing chain and cylinder walls, which are critical areas of concern in this engine family.
Engine Oil and Filter Specifications
Maintaining the correct oil level and filter condition is vital for the longevity of the GL450. The 2016 Mercedes-Benz GL450 3.0L requires a specific oil capacity to ensure proper lubrication of the entire crankcase and oil gallery system. When performing an oil change, the total capacity including the filter is 7.4 quarts. It is essential to pour the oil carefully and check the level after the refill to ensure the dipstick reads within the safe operating range. Never overfill, as this can cause foaming and damage the catalytic converter or other components.
The oil drain plug on the M276 engine should be torqued to specific specifications to prevent leaks or stripped threads. For the M12 bolt, the torque specification is 15 ft/lbs, while the M14 bolt requires 22 ft/lbs. Using the AMSOIL 5W-40 FS 100% Synthetic European Motor Oil or the AMSOIL 0W-40 FS 100% Synthetic European Motor Oil ensures that you meet the viscosity requirements for all temperature conditions, from -25°C upwards, providing immediate lubrication upon startup.
The WIX Oil Filter (Part Number 57059) is highly recommended for this vehicle. It is designed to capture microscopic particles that standard filters might miss, ensuring that the oil circulating through your expensive engine components remains clean. Clean oil is the lifeblood of any modern engine, and a high-quality filter extends the service interval and engine life. For those looking to optimize their oil change, AMSOIL offers convenient oil change kits that include the correct volume of oil, the filter, and necessary tools to simplify the maintenance process.
Transmission and Drivetrain Protection
The 2016 GL450 utilizes a 7-speed automatic transmission (722.904) that requires specific fluid to operate smoothly. The transmission fluid is critical for hydraulic pressure, clutch engagement, and heat dissipation within the transmission case. The total fill capacity for the 722.904 transmission is 9.5 quarts. It is important to note that there are variations in the datacard regarding the A89 code, which indicates a reduced-friction specification. Whether equipped with code A89 or without, using a high-performance synthetic fluid is the best approach to ensure longevity.
For the most demanding driving conditions, including towing, hill climbing, or extreme hot or cold weather, the AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid offers superior performance. It remains fluid in sub-zero temperatures and resists oxidation and shear during heavy use. For standard maintenance needs, the AMSOIL OE Fuel-Efficient 100% Synthetic Automatic Transmission Fluid is an excellent choice that protects against wear and maintains the friction characteristics required by the transmission manufacturer.
The GL450 also features a four-wheel-drive system with a transfer case. The lubrication requirements for the transfer case and differentials are equally important for off-road capability and highway stability. For the transfer case, the capacity depends on the specific configuration: a double-speed transfer case requires 3.2 pints, while a single-speed unit requires 1.1 pints. The front differential holds approximately 1.7 pints. In these applications, the high shear stability of AMSOIL automatic transmission fluids is often recommended to handle the extreme pressures within the transfer case gears and bearings, ensuring smooth power delivery to all four wheels.
Cooling and Brake Systems
Proper cooling system maintenance is essential for protecting the engine and the complex electronics in the GL450. The 2016 Mercedes-Benz GL450 has a cooling system capacity of 10.2 quarts. Over time, coolant can become acidic and lose its ability to prevent corrosion, which can lead to costly radiator or water pump failures. The AMSOIL Passenger Car & Light Truck Antifreeze & Coolant is a 50/50 pre-mix formulation that is phosphate-, nitrate-, nitrite-, silicate-, borate-, and amine-free, making it safe for all cooling system metals, gaskets, and hoses. It provides protection for up to 150,000 miles or 5 years.
For those who prefer to mix their own concentrate, the AMSOIL Propylene Glycol Antifreeze and Engine Coolant is an excellent option. It is concentrated, requiring mixing with distilled or high-quality water, and offers protection up to 150,000 miles in passenger cars and light trucks. The propylene glycol base also presents an environmental advantage as it is less toxic than traditional ethylene glycol, offering a safer choice for the environment without sacrificing performance.
Brake fluid absorption of moisture is a common issue that lowers the boiling point of the fluid, potentially leading to brake fade under heavy use. The GL450 requires a DOT 4 specification fluid. The AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid provides a high boiling point and consistent performance in varying temperatures. Its stability helps maintain a firm pedal feel and ensures reliable ABS and traction control system operation, which is critical for the safety of this heavy luxury SUV.
Engine and Fuel System Maintenance
Beyond the fluids, maintaining the cleanliness of the fuel system is key to preserving the efficiency of the direct injection and turbo technology in the GL450. Carbon buildup on fuel injectors can restrict flow and reduce power, leading to higher fuel consumption and potential engine knock. The AMSOIL P.i.® Performance Improver is a top-tier fuel additive designed to restore injectors to 100% flow rate after just one tank of fuel. It also helps control pre-ignition knock, a common concern in turbocharged engines, allowing you to run your vehicle with confidence.
For those who store their vehicle during the off-season or for long periods, preventing fuel degradation and engine corrosion is important. The AMSOIL Gasoline Stabilizer helps keep fuel fresh for up to 12 months, protecting against varnish, gum, and ethanol corrosion. Additionally, the AMSOIL Engine Fogging Oil provides a protective coating on internal engine components during storage, preventing rust and corrosion on cylinders and rings when the vehicle is not running.
About the Vehicle
The 2016 Mercedes-Benz GL450 is a flagship luxury SUV that combines the rugged capabilities of an off-road vehicle with the opulence and refinement expected from the German automaker. Positioned as the larger sibling to the GL-Class, the GL450 is renowned for its commanding presence and high-quality interior appointments. Under the hood, it features the robust 3.0L V6 biturbo engine (Engine Code 276.821), which was introduced to replace the previous V8 and V6 models in the lineup. This engine is celebrated for its impressive power-to-weight ratio, delivering strong acceleration and torque while maintaining respectable fuel economy for a vehicle of its size.
As a body-on-frame SUV built on the M-Class platform, the GL450 offers a blend of on-road comfort and off-road competence. It is equipped with a sophisticated 7-speed automatic transmission and a four-wheel-drive system with low-range gearing, making it capable of handling both snowy mountain passes and muddy trails. The interior is designed to accommodate up to seven passengers, with versatile seating configurations that prioritize passenger comfort and cargo flexibility. Owners appreciate the GL450 for its smooth ride quality, advanced technology features, and the prestige associated with the Mercedes-Benz brand. It serves as a versatile family hauler for those who refuse to compromise on luxury, performance, or safety.
Additional Maintenance Tips
To keep the GL450 in pristine condition, regular maintenance extends beyond just oil changes. Keeping the exterior and interior clean helps preserve the vehicle’s value and prevents corrosion. For exterior cleaning, the AMSOIL Miracle Wash Waterless Wash and Wax Spray requires just two steps and leaves a protective finish that repels dust and dirt. For engine bays that accumulate grime, the AMSOIL Engine Degreaser effectively removes oil and dirt without the need for heavy scrubbing.
For protecting metal surfaces from rust and corrosion, especially in areas with harsh winters or coastal salt air, the AMSOIL Heavy-Duty Metal Protector provides a long-lasting, wax-like coating that resists the elements. It is ideal for protecting steel, iron, and aluminum components. For general cleaning and care, the AMSOIL Interior Detailer – Light Lemon and AMSOIL Interior Detailer – Scent Free offer 90-day UV protection and trap odors, keeping the cabin smelling fresh and looking new.
By selecting the right fluids and additives, you can ensure that your 2016 Mercedes-Benz GL450 continues to perform at its best. Whether you are extending service intervals or simply wanting the highest level of protection, AMSOIL synthetic lubricants offer the solution for drivers who demand more from their vehicles. Always refer to the specific product codes and capacities listed above when ordering your maintenance supplies to ensure a perfect fit for your vehicle.