1. Due to the influence of temperature, the oil consumption will fluctuate, which is normal. Generally, the fuel consumption will increase when the temperature is low in winter, which is similar to turning on the air conditioner in summer. This is because the temperature is low and the heat emitted by the engine increases. The engine needs to keep a constant temperature to work normally. If it dissipates heat, it needs to burn more gasoline to generate heat. This part of gasoline is not used to do work and becomes waste heat, so the fuel consumption will increase, which is inevitable. Secondly, it takes a long time to warm up the car in winter, and it takes longer and more gasoline from the beginning to the normal water temperature.

2. The vehicle has not been maintained for a long time, and the dirty oil and air filter will also lead to an increase in fuel consumption. Dirty oil will lead to poor lubrication and increase the resistance of all moving parts of the engine. More energy is needed to overcome resistance and fuel consumption will increase. Dirty air filter leads to poor air intake. First of all, it needs to consume more energy when ingesting. Secondly, insufficient air intake leads to insufficient combustion, and a little gasoline is discharged without complete combustion. Driving the same mileage naturally requires more gasoline.

The spark plug should be replaced. Spark plugs are easily overlooked, and some people haven't changed them for more than 100 thousand kilometers. The life of spark plug is up. Although it can continue to be used, it will delay ignition due to insufficient ignition energy and miss the best ignition time.

4. The vehicle has too much carbon deposit. There are throttles, fuel injectors, air inlets and piston tops where carbon is deposited. Too much carbon deposition anywhere will lead to incomplete combustion and increase fuel consumption.