What grade of fuel should a Mercedes-Benz E300 use?
1 Answers
The 2022 Mercedes-Benz E300L Fashion model is equipped with a 2.0L turbocharged engine, which requires 95-octane gasoline, and has a fuel tank capacity of 66L, as per the officially released data. The higher the octane rating, the higher the octane number and the better the anti-knock performance. 95-octane gasoline contains 95% isooctane and 5% n-heptane. In addition to checking the appropriate gasoline grade in the vehicle's manual, the Mercedes-Benz E300L also allows you to check the fuel grade on the fuel tank cap, which will be clearly marked. Typically, the fuel grade can also be determined based on the engine's compression ratio. Vehicles with an engine compression ratio between 8.6-9.9 should use 92-octane gasoline, while those with a compression ratio between 10.0-11.5 should use 95-octane gasoline. If the compression ratio is higher, 98-octane gasoline is recommended. However, with the use of new technologies, the compression ratio alone cannot determine the fuel grade. High compression ratio engines can also be tuned to use lower octane fuel, as factors like ignition timing, turbocharging technology, and Atkinson cycle technology also play a role. If the Mercedes-Benz E300L occasionally uses the wrong fuel grade, simply switching back to the correct grade after consumption is sufficient. However, prolonged use of the wrong fuel grade can have the following effects: Using a higher octane fuel in a vehicle designed for lower octane will not cause damage, but the increase in octane number can alter the fuel's ignition point, leading to delayed combustion in the engine. This reduces the engine's power output and thermal efficiency, resulting in poorer performance. Using a lower octane fuel in a vehicle designed for higher octane can cause engine knocking. The significantly lower octane number reduces the fuel's ignition point, causing premature ignition during the compression stroke. If combustion occurs before the spark plug fires, resistance is created during the upward stroke. This resistance makes the engine run very unstably. If the knocking is imperceptible, it only increases noise without significant engine damage. If noticeable knocking occurs, it indicates severe engine conditions. The vibrations not only affect driving stability but also cause abnormal wear on the pistons and cylinders, potentially leading to cylinder scoring in severe cases.
