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What is SJ 10W-40 engine oil?

1 Answers

DelDaisy

07/29/25 10:25pm

SJ is the classification of the lubricant. The further the letter is in the alphabet, the higher the classification of the current lubricant, indicating better performance in all aspects. 10W40 refers to the viscosity of the lubricant, which is an indicator of engine oil. Here is the relevant introduction: 1. 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 act as a shock absorber for the engine. It is often referred to as the "blood" of a car. 2. 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. Additives compensate for and improve the shortcomings of the base oil, providing certain new properties, making them an essential part of the lubricant. 3. Classification of engine oil: Engine oils on the market can be simply divided into mineral oil and synthetic oil based on their base oil (vegetable oil is not considered due to its scarcity). Synthetic oils are further divided into full synthetic and semi-synthetic. Lubricant base oils are mainly categorized into mineral base oils and synthetic base oils. Mineral base oils are widely used and account for a large volume (about 95% or more), but some applications require products blended with synthetic base oils.

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