Should CS75 use 5W30 or 5W40 engine oil?
1 Answers
It is recommended to use original 5W30 grade engine oil. 5W30 has better fluidity than 5W40, which can reduce fuel consumption and heat up the engine faster. The difference between 5W30 and 5W40 engine oils lies in their viscosity. Higher viscosity means more oil consumption by the engine, higher noise levels, but better sealing performance. Therefore, when selecting oil viscosity, the age of the vehicle should also be considered. New cars have smaller gaps between engine components, so lower viscosity oil should be chosen, while vehicles with severe engine wear should use higher viscosity oil. The 'W' stands for winter. The smaller the number before W, the better the oil's low-temperature fluidity, the lower the usable environmental temperature, and the better the engine protection during cold starts. The number after W indicates the oil's high-temperature resistance. A higher value means better protection performance at high temperatures. For example, 5W40 means it can be used normally at temperatures below 40 degrees, while 5W30 means it can operate normally at temperatures as low as -30 degrees. In principle, as long as the oil doesn't deteriorate and is of sufficient quality, the oil film will remain intact, fully utilizing the oil's performance to protect the vehicle. However, if the oil contains excessive moisture, its lubrication performance and viscosity will degrade, reducing the friction-reducing effect of the oil film. Oil deterioration is inevitable and may lead to more serious accidents such as engine seizure or bearing failure.
