What is the difference between SP and SN gasoline engine oils?
4 Answers
The differences between SN and SP engine oils are as follows: 1. Different viscosity levels: The difference between SN and SP engine oils lies in their thickness or viscosity (phosphorus content) at a certain temperature. SN engine oil has a relatively lower phosphorus content. 2. Different viscosity numbers: Comparing the viscosity of SN and SP oils, SP has a higher viscosity number, indicating that SP's oil film is stronger than SN's, providing better protective performance. Additionally, SP offers stable improvements over SN in terms of noise reduction, fuel consumption, and acceleration performance. SP represents the oil quality grade, where SG, SJ, SL, SM, and the subsequent SP are all grades of gasoline engine oils. SP is currently the highest grade of gasoline engine oil, and the higher the grade of the oil, the better its various technical indicators.
I've studied motor oil specifications for many years. SP and SN are different API grades. SP is the latest standard, introduced in 2020, far superior to the SN from 2010. SN is decent for basic engine protection, but SP specifically addresses modern small-displacement turbocharged engines by preventing low-speed pre-ignition issues while also improving oxidation stability and fuel economy. Through extensive vehicle testing, I've observed significantly reduced engine deposits, cleaner emissions, and extended lifespan with SP oils. If you drive a turbocharged vehicle, SP is absolutely the preferred upgrade - it's compatible with stricter emission regulations. In short, technological progress has made SP the new benchmark, giving drivers extra confidence on the road.
I've changed engine oil several times and personally experienced the transition from SN to SP. SN has always been reliable but a bit outdated, while SP makes the engine run smoother with slightly reduced fuel consumption. The key is that SP offers better protection for turbocharged engines and reduces the risk of unexpected ignition, which is crucial for my long-distance driving. SP is slightly more expensive, but definitely worth it as it also minimizes sludge buildup. I recommend car owners regularly check their oil type and follow the manual's guidance—don't overlook this detail to enhance driving safety.
When I first started learning about car maintenance, I was quite clueless. Now I understand the simple comparison between SP and SN: SN is the older standard, which is okay for basic engine protection; SP is the latest upgrade, offering better resistance to high temperatures and turbo-related issues, making the car run smoother. My friend who uses SP says fuel consumption has improved noticeably, and it's especially friendly to new engines. Remember to check your vehicle's manual for recommendations before choosing engine oil. SP is suitable for most modern cars—don't overthink it, as switching is both convenient and safe.
