What is the difference between Shell engine oil SN and SP?

[StLeilani]

Engine oil SN and SP differ in the following aspects: 1. Viscosity level: The difference between engine oil SN and SP lies in the thickness or thinness (phosphorus content) of the oil at a certain temperature. SN engine oil has a relatively lower phosphorus content. 2. P viscosity number: Comparing the viscosity of SN and SP, SP has a slightly higher viscosity value, indicating that SP has a stronger oil film than SN, providing better protective performance. Additionally, SP offers stable improvements over SN in terms of noise reduction, fuel consumption, and acceleration performance. Engine oil SP represents the quality grade of the oil, with SG, SJ, SL, SM, and the subsequent SP being the grades for gasoline engine oils. SP is currently the highest grade for gasoline engine oils, and the higher the grade, the better the various technical specifications.

[BeauLynn]

I've been using Shell engine oil for many years and have tried both SN and SP grades in my own car. The SN is the older version, which performs decently but has poor oxidation resistance at high temperatures, leading to sludge buildup in the engine. The SP is the newer upgrade, specifically designed for chain protection. For my turbocharged car, using SP has significantly reduced chain wear and noise. The core difference is that SP enhances anti-wear and anti-carbon deposit capabilities, meeting the high demands of modern engines. If you frequently drive long distances or operate in high-temperature environments, choosing SP is safer. Although it costs a few dozen yuan more, it is more durable in the long run and reduces maintenance hassles. My oil change intervals have also extended, making it more worry-free overall. I recommend checking the owner's manual for the matching specification.

[OliveFitz]

The difference between SN and SP oil specifications mainly lies in standards and performance improvements. SP is a new standard introduced in 2020, optimized to address the shortcomings of SN, such as enhanced chain protection and reduced risk of low-speed pre-ignition. When used in direct-injection engines, SP can prevent excessive wear of components. From discussions in car enthusiast circles, if you drive a newer model, especially hybrid or turbocharged vehicles, SP provides better lubrication. The difference stems from API grade updates, reflecting stricter emission regulations. When choosing oil, I prioritize viscosity matching, but if the budget allows, upgrading to SP for improved reliability and efficiency is worth trying. Don’t overlook regular oil changes during maintenance to keep the engine clean and efficient.

[BrookeMarie]

The differences between Shell SN and SP are significant. SP is the successor to SN, primarily enhancing chain protection and oxidation resistance, which is crucial for modern engines, especially those with direct injection technology in high-performance vehicles. In comparison, SP offers greater stability under high temperatures, thereby extending engine life. Although slightly more expensive, it provides good value for money. When choosing, consider the vehicle's model year; older cars may suffice with SN, while newer models are recommended to use SP to avoid potential issues. Regular maintenance and timely oil changes are essential—don't just focus on the specifications.