
Mercedes-Benz GL SUV-class vehicles are equipped with 4.0-liter engines. Engine displacement and automobiles: The space volume that the piston moves from top dead center to bottom dead center is called cylinder displacement; if the engine has multiple cylinders, the sum of all cylinders' working volumes is called engine displacement. It is generally expressed in liters (L). Engine displacement is one of the most important structural parameters, which represents the size of the engine more accurately than bore diameter and cylinder count. Many engine specifications are closely related to displacement. Displacement classification: In China, passenger vehicle classification is determined by engine displacement. Mini cars have displacements ≤1.0L; compact cars range from 1.0-1.6L; midsize cars range from 1.6-2.5L; executive cars range from 2.5-4.0L; and luxury cars have displacements >4.0L.

Mercedes-Benz 4.0-liter displacement models are currently mainly found in the AMG high-performance series and some luxury models. For example, the AMG GT sports car series, ranging from the base version to the GT R; also the G-Class off-road vehicles, like the new G 500 and the hardcore G 63 AMG; in sedans, the C 63 AMG, E 63 AMG, and S 63 AMG are all equipped with 4.0T engines; SUVs like the GLC 63 and GLE 63 also feature this engine. Most of these models come with a twin-turbo V8 engine, delivering power in the range of 500-600 horsepower, with extremely fierce acceleration. However, it's important to note that after 2020, some models were updated with hybrid systems, so when buying a used car, it's essential to check the configuration list. For daily driving, these cars are not fuel-efficient, but the engine sound and acceleration are absolutely worth the price.

I've driven my friend's Mercedes 4.0T models a few times, and the ones that left the deepest impression were the G 63 AMG and C 63 AMG. The G 63 offers a high seating position with excellent visibility and strong off-road capabilities. Driving it in the city feels like piloting a tank, but it's undeniably cool. The C 63 is more balanced, with rear-wheel drive that makes drifting a blast, perfect for those who love driving excitement. These cars have deep, powerful engine notes, and they're virtually unbeatable from a standstill at traffic lights. However, maintenance costs are high—an oil change requires 8 liters, and tires wear out quickly. For speed enthusiasts, the AMG GT series is even more pure, with its sleek two-door design and exceptional cornering grip.

Choosing a Mercedes with a 4.0L engine depends on usage. The AMG GT two-seater sports car suits car enthusiasts, offering precise handling and excellent track performance. Four-door coupes like the C63 and E63 balance practicality—good for grocery runs and high-speed drives. For off-roading, the G-Class is ideal with strong off-road capability and high resale value. These cars all exceed 500 horsepower, but fuel consumption is generally over 15L; the air suspension version is more comfortable for city driving. Also, consider a used car within three years for better value—new cars are too expensive and often require waiting for allocation.

Having worked on Mercedes-Benz for over a decade, the 4.0T engine is commonly found in the G500, C63, and AMG GT. The main issue is the turbo water pipe connection prone to leakage, so it's recommended to inspect the sealing rings every 20,000 kilometers. Spark plug lifespan is shorter than in regular cars, requiring replacement at 40,000 kilometers. It's essential to use 0W-40 engine oil; otherwise, high-temperature protection is insufficient. Long-term low-speed driving can lead to carbon buildup, which can be mitigated by driving at high speeds for a stretch each month. Maintenance costs are indeed high—replacing a turbo assembly can cost 30,000 to 40,000 RMB—but fortunately, the engine itself is quite durable.

Mercedes-Benz's 4.0T V8 engine comes in two versions, the M177 and M178, used in AMG and high-end series. The technical highlight is the twin-turbo layout within the cylinder bank angle, offering faster response than traditional externally mounted setups. A variable oil pump and coasting mode help save fuel, reducing combined consumption by 7%. The AMG-tuned version features cylinder deactivation technology, automatically shutting off four cylinders during cruising. The engine also utilizes NANOSLIDE cylinder wall coating to reduce friction and enhance durability. This powertrain delivers 650 Nm of torque in the C63, weighing 20 kg less than the previous 6.2L naturally aspirated engine.


