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What Causes Increased Fuel Consumption After an Oil Change?

1 Answers

ColeLynn

07/29/25 4:06pm

The reasons for increased fuel consumption after an oil change: The viscosity of the new oil is higher than before. For example, if the original oil viscosity was 5w-30 and the new oil viscosity is 5w-40, the increased viscosity leads to greater resistance, resulting in higher fuel consumption. Definition of fuel consumption: Fuel consumption per 100 kilometers refers to the amount of fuel a vehicle consumes when driving a certain speed over 100 kilometers on the road. It is a theoretical indicator for vehicles. Calculation of actual fuel consumption: Fuel consumption per 100 kilometers = Volume of fuel consumed (liters) ÷ Distance traveled with that fuel (kilometers) × 100. For example, if a car consumes 4 liters of fuel to travel 50 kilometers, then the fuel consumption per 100 kilometers = 4 liters ÷ 50 kilometers × 100 = 8 liters/100 kilometers. The fuel consumption per 100 kilometers is not fixed; factors such as road conditions, load, temperature, and whether the air conditioning is on can all affect fuel consumption.

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