What is 20w50 engine oil?

[McPiper]

20w50 engine oil refers to the specification of engine oil. The details are as follows: 1. The numbers represent: 20W indicates that it can start normally at temperatures as low as -15 degrees Celsius, where W stands for WINTER. The number before W represents the flow performance at low temperatures, with smaller numbers indicating better starting performance in cold conditions; 50 represents the viscosity and flowability of the oil, meaning the number after W indicates the oil's stability at high temperatures (i.e., the likelihood of thinning). A larger number suggests better high-temperature stability. 2. Lubricant viscosity classification: The SAE viscosity classifications for all-season oils include: 5W-20, 5W-30, 5W-40, 5W-50, 10W-20, 10W-30, 10W-40, 10W-50, 15W-20, 15W-30, 15W-40, 15W-50, 20W-20, 20W-30, 20W-40, 20W-50.