What Does the Motor Oil Grade Mean?

1 Answers
DeAriana
07/29/25 11:24am
Motor oil grades consist of two parts: classification and viscosity specification. The oil grade usually indicates viscosity and quality. The smaller the number in front, the better the low-temperature fluidity of the oil, representing a lower usable ambient temperature and better protection for the engine during cold starts. The number after "w" is an indicator of the oil's high-temperature resistance, with larger values indicating better protective performance at high temperatures. Motor oil, also known as engine lubricant, serves to lubricate and reduce friction in the engine, assist in cooling, seal against leaks, prevent rust and corrosion, and provide shock absorption. Automotive lubricants are categorized into mineral lubricants, synthetic lubricants, and semi-synthetic lubricants.
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