53.30. Why is it recommended to change engine oil during the winter period?
UAДля чого рекомендується замінювати моторну оливу в зимовий період?
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This exam question from the Traffic Rules of Ukraine concerns the safe operation of a vehicle during the cold season and the role of maintenance in preventing breakdowns and emergency situations. In winter, it is especially important for the engine to start reliably and for all components to operate in normal mode, since malfunctions or incorrect selection of technical fluids can affect controllability and overall road safety.
The question tests understanding of the section of the traffic rules regarding the driver's duties to ensure the vehicle is in proper technical condition before driving (point 2.3), as well as requirements for technical condition and compliance with the manufacturer's instructions (point 31.1). The logic is simple: in freezing temperatures, engine oil becomes thicker, making it harder to circulate through the lubrication system and slower to form a protective lubricating film. This reduces its effectiveness at the most critical moment—during a cold start, when component wear increases.
Among the answer options, the correct explanation is the increase in viscosity in the cold and the drop in effectiveness: this corresponds to the real physical properties of oil and the practice of seasonal maintenance. The statement about a sharp decrease in viscosity in winter is incorrect, as the opposite occurs. And the argument about "improving fuel economy" may be a secondary effect of properly selected oil, but it is not the main reason tested by the theoretical exam and the traffic rules regarding the technical condition of the vehicle.
Clause 2.3 (driver's duties regarding ensuring the technical serviceability of the vehicle)
To ensure road safety, the driver is obliged to: a) before departure, check and ensure the technical serviceability and completeness of the vehicle, the correct placement and securing of the cargo.
This clause checks the understanding that the driver must ensure in advance the serviceability and operability of units and fluids on which the reliable starting and operation of the engine in winter conditions depend.
Clause 31.1 (requirements for the technical condition of the vehicle and compliance with manufacturer’s instructions)
The technical condition of vehicles and their equipment must comply with the requirements of standards relating to road safety and environmental protection, rules of technical operation, instructions of manufacturing enterprises, and other regulatory and technical documentation.
This clause covers the necessity to follow the regulations and manufacturer’s recommendations regarding seasonal maintenance (in particular, the selection/replacement of engine oil according to temperature conditions) in order to maintain the proper technical condition of the vehicle.
That is, the correct answer is - "Due to cold weather, the viscosity of engine oil increases sharply, and its effectiveness decreases.", considering that according to the Traffic Rules, the driver is obliged to ensure the technical serviceability of the vehicle before departure and to maintain its technical condition in accordance with the instructions of the manufacturer.
In the winter period, a car operates under low temperature conditions, and this directly affects the properties of engine oil. The oil determines how easily the engine starts and how quickly it lubricates the parts after starting.
When the air temperature drops, engine oil becomes thicker. Because of this, it circulates more slowly through the lubrication system and forms the necessary lubricating film on engine parts less effectively. In practice, this means that during a cold start, the engine operates for some time with insufficient lubrication, which increases the load on friction components and reduces the effectiveness of the oil.
This is why driver training materials emphasize: in cold weather, it is advisable to change the engine oil to ensure normal lubrication conditions and reduce the negative impact of low temperatures on the engine.
Therefore, the correct answer is: "Due to the cold, the viscosity of engine oil increases sharply, and its effectiveness decreases," since in frost the oil thickens, circulates worse, and does not provide proper lubrication of engine parts.