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What is the difference between SP-grade and SN-grade engine oil?

2 Answers

MacVivian

07/29/25 12:04am

SP-grade and SN-grade engine oils differ in their thickness and viscosity at certain temperatures, which is due to variations in phosphorus content. SN-grade engine oil has relatively lower phosphorus content, while SP-grade oil has a higher viscosity value, indicating that SP-grade oil forms a stronger oil film than SN-grade, offering better protective performance. The following provides an introduction to engine oil: 1. Definition of engine oil: Engine oil is the lubricant used in engines, composed of base oil and additives. As a type of machinery, engines have specific requirements for lubricants that align with general machinery, such as appropriate viscosity, certain levels of oxidation resistance, wear resistance, corrosion prevention, and viscosity-temperature properties. 2. Function of engine oil: With a density of approximately 0.91×10³ (kg/m³), engine oil serves to lubricate and reduce friction, assist in cooling, seal against leaks, prevent rust and corrosion, and provide shock absorption and cushioning for the engine.

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DelJanelle

08/12/25 4:21am

The difference between SP-grade and SN-grade engine oil, I'll explain from my car repair experience: SP is the new API standard upgraded in 2020, while SN is the older version from 2010. The core changes lie in stricter testing and requirements: SP can prevent low-speed pre-ignition issues, which is crucial for turbocharged vehicles, reducing engine damage; it also enhances timing chain protection to avoid premature wear. In terms of fuel consumption, SP can improve fuel efficiency by 1-3%, saving some money on long trips. Regarding compatibility, SP can be used in vehicles from the SN era, but for new car models, it's recommended to directly use SP for better engine protection. Don't overlook oil selection during maintenance, as regular oil changes can extend your car's lifespan. Choosing the wrong grade may increase the risk of accelerated engine aging.

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