Why should we pay special attention to viscosity when choosing lubricating oil in winter?
author: Ann
2024-12-13
First, when the engine is running at high temperature, the anti-oxidation stability of the lubricating oil deteriorates, aggravating its thermal decomposition, oxidation and polymerization. At the same time, dust in dry air and moisture in humid air enter the engine oil pan through the intake system and crankcase vents to contaminate the lubricating oil, so the lubricating oil is easy to deteriorate. The viscosity of the lubricating oil changes with the increase of temperature, that is, the viscosity of the lubricating oil decreases when heated, which can easily cause the lubricating oil to be consumed too quickly.
When the engine is running at high temperature, the metal parts have large thermal expansion, the normal matching clearance between the parts becomes smaller, and the wear is aggravated. At the same time, the high-temperature running engine adheres to carbon deposits and colloids on the piston top, combustion chamber wall, valve head and other parts, making the thermal properties of metal parts worse and accelerating the damage of the parts. In addition, due to overheating of the engine, the oil becomes thinner, the oil pressure decreases, the lubricating oil film is not easy to form, and the wear of the parts is also accelerated. Therefore, in summer, special attention should be paid to checking the oil dipstick frequently, and if there is any defect, it should be replenished in time. It is necessary to check the oil pressure regularly and choose the appropriate lubricating oil.
In summer, under the condition of ensuring sufficient lubrication, lubricants with corresponding viscosity should be selected according to the temperature range, engine temperature and actual vehicle conditions during use. The viscosity of lubricants is often marked with SAE grades. For example: SAE15W-40, SAE5W-40. The number after "W" indicates the index of lubricant's high temperature resistance. The larger the number, the better the protection performance of the lubricant at high temperature. Consumers in most areas can choose 15W-40 or 10W-40 summer lubricants.
When the engine is running at high temperature, the metal parts have large thermal expansion, the normal matching clearance between the parts becomes smaller, and the wear is aggravated. At the same time, the high-temperature running engine adheres to carbon deposits and colloids on the piston top, combustion chamber wall, valve head and other parts, making the thermal properties of metal parts worse and accelerating the damage of the parts. In addition, due to overheating of the engine, the oil becomes thinner, the oil pressure decreases, the lubricating oil film is not easy to form, and the wear of the parts is also accelerated. Therefore, in summer, special attention should be paid to checking the oil dipstick frequently, and if there is any defect, it should be replenished in time. It is necessary to check the oil pressure regularly and choose the appropriate lubricating oil.
In summer, under the condition of ensuring sufficient lubrication, lubricants with corresponding viscosity should be selected according to the temperature range, engine temperature and actual vehicle conditions during use. The viscosity of lubricants is often marked with SAE grades. For example: SAE15W-40, SAE5W-40. The number after "W" indicates the index of lubricant's high temperature resistance. The larger the number, the better the protection performance of the lubricant at high temperature. Consumers in most areas can choose 15W-40 or 10W-40 summer lubricants.
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