What causes increased fuel consumption after an oil change?

1 Answers
AxelAnn
07/25/25 12:37pm
Reasons for increased fuel consumption after an oil change: The viscosity of the new oil is higher than the old oil, or the wrong oil type was used. Detailed explanations of the reasons: The viscosity of the new oil is higher than the old oil: If the viscosity of the new oil is higher than the old oil, it creates resistance during engine operation. Although the resistance is not significant, it can still slightly increase fuel consumption. After changing the oil, it's also important to consider whether the car has been driven on poor road conditions. Additionally, during summer, using the air conditioning in the car also consumes more fuel. Using the wrong oil type: If, during the oil change, 5W30 oil was replaced with 10W40 oil, the increased viscosity of the oil creates resistance in the engine, leading to higher fuel consumption and accelerated wear.
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