What is SJ 10W-40 engine oil?

1 Answers
DiKaylee
07/29/25 8:22pm
SJ refers to the grade of the lubricating oil. Here are the relevant details: Performance aspects: The further back the letter is in the alphabet, the higher the grade of the current lubricating oil, indicating better overall performance; while 10W40 refers to the viscosity of the lubricating oil, which is an indicator of engine oil. Definition of engine oil: Engine oil, also known as engine lubricant, serves to lubricate and reduce friction, assist in cooling, seal against leaks, prevent rust and corrosion, and provide shock absorption for the engine. It is often referred to as the 'blood' of a car. Composition of engine oil: Engine oil consists of two parts: base oil and additives. The base oil is the main component of the lubricant, determining its basic properties, while additives compensate for and improve any deficiencies in the base oil's performance, imparting new characteristics. Additives are an essential part of engine oil.
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