What does 5W in motor oil mean?
2 Answers
In motor oil, 5W represents the minimum applicable temperature of the oil, indicating that this oil can still function normally at a minimum temperature of -30 degrees Celsius. The specific details are as follows: 1. The W in motor oil stands for Winter, and it is categorized into 0W, 5W, 10W, 15W, 20W, and 25W. 2. The smaller the number before the W, the better the low-temperature fluidity of the oil, indicating a lower environmental temperature it can be used in and better protection for the engine in cold environments. 0W represents -35 degrees, 5W represents a minimum temperature of -30℃, and 10W represents -25 degrees.
Hi, a friend of mine who loves tinkering with engines told me that '5w' on motor oil packaging represents its fluidity at low temperatures. The 'W' stands for winter, and the number '5' indicates that it remains thin and flows well at temperatures as low as -25 degrees Celsius, making cold starts easier in winter. The lower the number, the better the fluidity—for example, '0w' performs even better in colder conditions. The following number, such as '30', represents the viscosity at high temperatures, protecting components from wear. Choosing the wrong oil can lead to difficulty starting the engine or increased fuel consumption. It's best to check the car manual for the recommended oil type before purchasing. During regular maintenance, have the mechanic check and replace the oil as needed, typically every 5,000 to 10,000 kilometers.
