What Grade of Engine Oil is API SP?

[McSawyer]

API SP is currently the highest-grade fully synthetic oil in API certification, belonging to the premium engine oil category and suitable for China VI vehicles. API SP oil is the new SP grade introduced by the American Petroleum Institute, excelling in environmental protection, resistance to low-speed pre-ignition, and chain protection. SP-grade oil provides lubrication and wear reduction, auxiliary cooling, sealing and leak prevention, rust and corrosion protection, as well as shock absorption for the engine. Conventional engine oil typically requires replacement every 5,000 to 8,000 km, whereas API SP-grade oil can last up to 12,000 km. The SP grade is primarily used in high-end luxury vehicles. API Engine Oil Classification: API engine oils are divided into two categories: The "S" series represents oils for gasoline engines, with specifications including API SA, SB, SC, SD, SE, SF, SG, SH, SJ, SL, SM, and SN. The "C" series represents oils for diesel engines, with specifications including API CA, CB, CC, CD, CE, CF, CF-2, CF-4, CG-4, CH-4, and CI-4. If both "S" and "C" letters are present, it indicates that the oil is suitable for both gasoline and diesel engines.