Should the Mercedes-Benz G63 use 95 or 98 octane gasoline?

[VanAmara]

Mercedes-Benz G63 is recommended to use 98 octane gasoline, because turbocharged cars using 98 octane gasoline can increase engine pressure, make the fuel burn more fully, and allow the vehicle's performance to be better utilized. The Mercedes-Benz G63 AMG is a model based on the latest 2013 facelifted Mercedes-Benz G-Class. Compared to the standard version, the Mercedes-Benz G63 AMG is equipped with a large front bumper, and the full body styling is extremely dynamic and domineering. In terms of power, the Mercedes-Benz G63 AMG is equipped with a 5.5L V8 twin-turbocharged engine, with a maximum power output of 544 horsepower and a maximum torque of 760 N·m. In terms of acceleration, the car can accelerate from 0-100km/h in 5.4 seconds, with a top speed of 210km/h. It perfectly balances power, comfort, and off-road performance. The higher the quality of the car, the better the engine performance, and the higher the corresponding octane rating of the fuel required. The main difference between different octane ratings lies in the different octane values they contain. 95 octane gasoline refers to gasoline with 95% isooctane and 5% n-heptane, while 98 octane gasoline refers to gasoline with 98% isooctane and 2% n-heptane. The higher the octane value, the better the anti-knock performance and the lower the fuel consumption.

[VanRylee]

I always insist on using 98-octane fuel for my Mercedes-Benz G63, even though it's more expensive, it's absolutely worth it. This AMG engine has a high compression ratio and requires high-octane gasoline to resist knocking. 98-octane gasoline ensures smoother engine operation and more linear power output. The fuel cap clearly recommends 98-octane, with 95-octane only for emergency use. Once, in a remote area, I had to use 95-octane and immediately noticed slower throttle response and increased engine noise. Long-term use of lower-octane fuel may lead to more carbon deposits or even piston damage, and the repair costs would cover several years of 98-octane fuel. A high-performance car deserves high-quality fuel—don't skimp on this and shortchange it.

[MacLukas]

Regarding fueling the G63, the manual clearly states that 98 octane is the preferred choice. Based on my own tests, 98 octane fuel allows this 4.0T V8 engine to deliver its maximum 612 horsepower, while 95 octane triggers the engine's knock sensors, causing the ECU to automatically reduce ignition timing and resulting in a power loss of approximately 5%. More importantly, 98 octane fuel contains higher-quality additives that effectively clean the direct injection system's fuel injectors. Of course, if 98 octane is unavailable at the gas station, temporarily using 95 octane is acceptable, but remember not to fill more than half a tank and mix in 98 octane fuel as soon as possible to dilute it. When refueling, pay attention to the labels on the fuel pumps, as some gas stations may label 98 octane as 'super premium'—don't get it wrong.

[SanSavannah]

Friends driving the G63 should note that refueling this vehicle requires attention. The manufacturer recommends using 98-octane fuel, which has a higher octane rating and is particularly suitable for high-powered turbocharged cars. For daily city commuting, using 95-octane may not make much difference, but when driving on highways or climbing slopes, 98-octane fuel better suppresses knocking. I've compared fuel consumption—under the same driving conditions, 98-octane saves about 0.8 liters per 100 kilometers compared to 95-octane, making the price difference negligible. Some gas stations' 98-octane fuel contains PIBA detergent, which is better for the engine. If 98-octane is often unavailable, it's advisable to keep two bottles of fuel additive in the trunk for emergencies. Remember to turn off the engine while refueling and tighten the fuel cap afterward—these small details affect your car's condition.

[Emma]

The fuel cap of the Mercedes-Benz G63 is imprinted with '98 octane gasoline recommended,' and this design is well-founded. The AMG engine operates under extremely high cylinder pressure, where 95 octane fuel may pre-ignite under high temperature and pressure, leading to knocking. 98 octane fuel offers better anti-knock properties, ensuring more complete and stable combustion. I've observed with an OBD scanner that engine vibration values are 15% lower with 98 octane compared to 95. However, the availability of 98 octane at gas stations in China is currently limited. If traveling to remote areas, it's advisable to check gas stations in advance. Occasionally using 95 octane is not a cause for concern, just avoid exceeding 4000 RPM. The key is not to compromise by using 92 octane, and never mix with ethanol gasoline indiscriminately, as it can easily clog the fuel system.

[DelMiles]

As a G63 owner sharing refueling tips: Premium 98 is the top choice, not just for performance but also for long-term maintenance. This engine has an 11:1 compression ratio, and 98-octane fuel burns cleaner with less carbon buildup. I always refuel with 98 during my monthly long-distance trips, and after three years, the engine remains in pristine condition. While the engine can adapt to 95-octane fuel, it increases fuel consumption by 0.5 liters, making it less economical in the long run. Note that fuel quality varies significantly between brands, so sticking to major stations like Sinopec is recommended. Additionally, refueling in winter is better due to higher fuel density in cold temperatures. Lastly, avoid overfilling—stop at the first click of the pump nozzle to prevent carbon canister saturation and gasoline odors.