What is the SJ grade of automotive engine oil?
1 Answers
SJ is a gasoline engine oil standard set by the American Petroleum Institute, representing the 1996 standard; SN, introduced in 2010, is the latest standard. Therefore, SJ-grade oil is not considered high-grade, but its performance is still decent. More details are as follows: 1. Engine oil grades are classified based on quality and viscosity. The quality grade is indicated by a combination of two letters. 'S' denotes oil for gasoline engines, while 'C' denotes oil for diesel engines. If both letters are present, the oil is universal. Generally, specifications range from SA to SN (there is no SI), with higher letters indicating better quality. International brands typically offer oil grades above SF. 2. In terms of viscosity, 10W-40 is its SAE standard viscosity value. This value indicates that the oil is multi-grade. 'W' stands for WINTER, and the number before 'W' represents the oil's flow performance at low temperatures—the lower the number, the better the cold-start performance. The number after 'W' indicates the oil's stability at high temperatures (i.e., its resistance to thinning). A higher number means better high-temperature stability, but it also leads to higher fuel consumption.