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Is Full Synthetic Oil SP or SN Better?

3 Answers

StAurora

08/27/25 6:20am

Full synthetic oil SP is better. Below are the differences between SP and SN oils and the functions of engine oil: Differences between SP and SN oils: Different grades: SP is currently the highest grade of engine oil; SN is the second-highest grade. Oil film: SP has a stronger oil film; SN has a weaker oil film. Protective performance: SP offers stronger protective performance; SN provides average protective performance. Functions of engine oil: It lubricates and reduces friction in the engine, assists in cooling, seals against leaks, prevents rust and corrosion, and cushions shocks. The relationship between base oil and lubricating oil: Base oil is the main component of lubricating oil, determining its basic properties, while additives compensate for and improve any deficiencies in the base oil's performance, imparting certain new characteristics.

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DelHailey

09/09/25 5:13am

I've been driving this car for several years and always pay special attention to engine oil selection. Regarding the SP and SN standards for full synthetic oils, I clearly think SP is better. Simply put, SN is the older standard while SP is the newer upgraded version, providing stronger protection, especially in preventing low-speed pre-ignition and reducing engine wear. From my experience, newer car models like turbocharged engines feel more secure using SP oil, avoiding carbon buildup issues and extending engine life. If you drive frequently or often take long trips, SP oil can save you a lot of hassle by reducing repair frequency. Sure, it's slightly more expensive, but it's worth it in the long run. I now only choose SP-grade oils from brands like Mobil or Castrol - the driving experience is smoother with less noise.

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Madison

10/23/25 6:04am

As someone with a bit of interest in automotive technology, I would choose SP-grade engine oil. Its technical specifications are far superior to SN. SP is the latest API standard introduced to address modern engine challenges, such as solving turbo lag lubrication issues and reducing sludge formation. Actual tests show that SP can improve fuel efficiency and protect high-temperature components. While SN is still usable, it's only suitable for older car models. SP has strong compatibility and works well for both new and old vehicles. I recommend choosing SP-grade oil during regular oil changes to prevent premature engine aging. Don't skimp on this aspect of daily maintenance—oil quality directly impacts your beloved car's performance and gives you peace of mind while driving.

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