Is SP Grade Engine Oil Not Necessarily Better Than SN?

1 Answers
AbelRose
07/30/25 4:37am
SP engine oil has a higher grade, therefore it is better. The difference between SN and SP engine oil: At certain temperatures, the thickness and viscosity of the two grades of engine oil differ. SN engine oil has relatively less phosphorus content. SP engine oil has a higher viscosity value, thicker oil film, and provides better protective performance. SP is currently the highest grade of gasoline engine oil. The higher the grade of the engine oil, the higher its various technical indicators, which can significantly extend the engine's service life, prolong the oil change interval, and maintenance cycle. Introduction to engine oil: Engine oil mainly contains anti-wear additives, detergents, dispersants, and multi-grade oil viscosity index improvers. The main functions of engine oil are to reduce friction and wear of moving parts, remove sludge and varnish from the engine, neutralize acids produced from fuel and lubricant oxidation, improve the sealing of piston rings, and cool the engine by carrying away heat from moving parts.
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