What Causes High Fuel Consumption in Mercedes-Benz E300?
2 Answers
Here are the reasons for a sudden increase in fuel consumption in Mercedes-Benz E300: 1. Too much engine oil: Excessive oil added during maintenance leads to increased fuel consumption. Every time the car goes for maintenance, it is necessary to change the engine oil. When changing the oil, the old oil must be completely drained, and the new oil should be added according to the standard dosage. 2. Loose spark plugs: If fuel consumption rises immediately after changing the spark plugs, many people naturally suspect the spark plugs. If the mechanic does not tighten the spark plugs to the manufacturer's specified torque during replacement, it can cause gas leakage. High-temperature and high-pressure gases slowly leak out, reducing the pressure in the cylinder. 3. Incorrect spark plug model: Using inferior spark plugs or spark plugs that do not match the original specifications, especially those with incorrect gaps or heat values, can also lead to increased fuel consumption.
As a long-term owner of a Mercedes-Benz E300, I've found that sudden increases in fuel consumption are quite common. First, check your driving habits—frequent rapid acceleration or hard braking, as well as prolonged idling in congested areas, can cause the engine to burn more fuel. Second, vehicle maintenance is crucial. A dirty air filter or worn spark plugs can lead to incomplete combustion, wasting fuel, while underinflated tires increase rolling resistance, adding 1-2 liters of fuel consumption. If the E300's turbocharger has carbon buildup or malfunctions, engine efficiency drops and fuel usage rises. Additionally, using low-quality gasoline or engine oil can impair combustion efficiency. Environmental factors like running the AC in summer or carrying excessive weight long-term also drive up fuel consumption. Regularly check the engine light to see if the oxygen sensor is faulty. I recommend servicing every 5,000 km to maintain normal fuel efficiency—saving money and ensuring peace of mind.
