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What is the difference between SP and SN engine oil?

2 Answers

LeFernando

07/29/25 2:27am

Differences between SP and SN engine oil: 1. Different grades: SP is currently the highest grade of engine oil; SN is the second grade. 2. Oil film: SP has a stronger oil film; SN has a weaker oil film. 3. Protective performance: SP has stronger protective performance; SN has average protective performance. Below is additional information: 1. The function of engine oil: It can lubricate and reduce friction in the engine, assist in cooling, seal against leaks, prevent rust and corrosion, and provide shock absorption. 2. The relationship between base oil and lubricating oil: Base oil is the main component of lubricating oil, determining its basic properties. Additives can compensate for and improve the shortcomings of the base oil in terms of performance, giving it certain new properties.

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DeLiam

08/12/25 6:25am

The difference between SP and SN engine oils mainly lies in API classification and protective performance. SN is a standard introduced in 2010, focusing on reducing engine carbon deposits and emission control, suitable for most regular vehicles. I find it cost-effective for my older car. SP is the new 2020 standard with upgraded low-speed pre-ignition prevention, which is particularly important for turbocharged engines, helping to prevent knocking and wear. After switching to SP in my new car, the engine runs smoother and lasts longer. Overall, SP offers stronger cleaning properties and high-temperature protection but is slightly more expensive; SN is more versatile and suitable for budget-conscious owners. The key is to consider your engine type and manufacturing year – newer cars should prioritize SP. Regular checks of oil specifications can extend vehicle lifespan and avoid major repairs.

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Can SN and SP engine oils be mixed?

Whether SN and SP engine oils can be mixed. SP represents the quality grade of engine oil, with SG, SJ, SL, SM, and the subsequent SP being grades for gasoline engine oils. SP is currently the highest grade for gasoline engine oils. The higher the grade of the oil, the better its various technical indicators, which can significantly extend the engine's service life, prolong oil change intervals and maintenance cycles, and reduce car maintenance costs. The difference between SN and SP engine oils lies in the thickness (or viscosity) of the oil at a certain temperature, which can also be described as the difference in phosphorus content. Below is a detailed introduction: 1. SN engine oil has a relatively lower phosphorus content; moreover, in terms of viscosity comparison between SN and SP, SP has a slightly higher viscosity value; 2. This indicates that SP's oil film is stronger than SN's, offering better protective performance. Additionally, SP provides stable improvements over SN in terms of noise reduction, fuel consumption, and acceleration performance.

How long does it take to charge a NIO?

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