What is the difference between SP oil and SN oil?

[Aurora]

Here are the specific differences between SN oil and SP oil: 1. Grade: SN is the second grade of gasoline engine oil; SP is currently the highest grade of gasoline engine oil. 2. Oil film: SN has a relatively weak oil film; SP has a relatively strong oil film. 3. Protection performance: SN has average protection performance; SP has relatively strong protection performance. Below is extended information on the specific introduction of engine oil quality grades: 1. API Grade: API is the abbreviation of the American Petroleum Institute. The API grade represents the quality grade of engine oil. It uses codes to describe the working capability of engine oil. The grades are divided into SA, SB, SC, SD, SE, SF, SG, SH, SJ, SL, SM, and SN, with the later letters indicating higher grades. SP grade is currently the highest grade of engine oil. SJ is the standard from the 1990s, SL is the standard from 2001, SM is the standard from 2004, and SN is the standard from 2010. 2. Engine oil grade: SP-grade oil, as the highest grade of engine oil, is generally classified as fully synthetic oil. Semi-synthetic oils are mainly SL and SM grades, with some being SN grade. Among international brands, most engine oils are SF grade or higher. For example, Shell Helix Ultra is API-SM grade, while Shell Helix Red is API-SG grade, indicating that the quality grade of Helix Ultra is higher than that of Helix Red.

[Julianna]

I think the main difference between SP and SN engine oils lies in the upgrade of API standards. SP is a new standard introduced in 2020, which offers stronger anti-wear protection compared to the previous SN, especially addressing low-speed pre-ignition issues, making engine operation smoother and more durable. In terms of fuel economy, SP can save a bit more fuel due to its improved lubrication formula. If you drive a turbocharged or direct-injection engine, SP is more suitable. However, SN oil is also good and fits cars manufactured before 2010. After trying both, I noticed that engine noise reduced a bit after switching to SP. For daily maintenance, it's best to check the owner's manual and use what's recommended—don't blindly switch to save a little money, as it might damage the engine. Overall, SP is like an upgraded version with enhanced protection features.

[LaMary]

As someone who enjoys tinkering with cars, I've found that the core difference between SP and SN lies in performance optimization. SP is designed for modern car engines, with additional tests to prevent low-speed pre-ignition, which is common in turbocharged vehicles and helps reduce unexpected wear. The SN standard is older, with decent cleaning power but slightly lower fuel efficiency. I feel that SP oil provides smoother acceleration, especially during long-distance driving where engine heat management is better. However, not all cars require SP; older vehicles can function perfectly well with SN. When changing oil, just check the specification label—key points include selecting the right viscosity grade to avoid mixing and ensuring regular oil changes are prioritized.

[DeIsabelle]

SP engine oil is newer than SN, with improvements mainly in protection and environmental friendliness. When driving, I noticed that SP provides more comprehensive engine protection, reducing carbon buildup issues, making it suitable for new cars, especially those with direct injection technology. SN oil is also good, but slightly older. When choosing, consider the car's age: SP is recommended for new cars, while SN is sufficient for older ones. It's also important to follow the correct oil change intervals.