Which is better, SP or SN grade engine oil?
2 Answers
The overall performance of SP grade engine oil is slightly better than that of SN grade. The differences and certifications between SP and SN grade engine oils are as follows: Differences: They differ in thickness and viscosity (phosphorus content) at certain temperatures. SN grade oil has relatively lower phosphorus content. Comparing the viscosity of SN and SP grade oils, SP is slightly more viscous, meaning SP forms 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. Certifications: Since SP grade certification for engine oil is not yet widely available, most vehicles currently use SN grade oil, which fully meets the requirements of vehicle engines. Generally, the higher the oil grade, the more expensive it is.
From a car repair experience perspective, SP and SN are engine oil grades, with SP being the latest and offering superior performance. It provides better protection against low-speed pre-ignition, which is particularly beneficial for turbocharged engines, reducing carbon buildup and engine wear. SN is an older grade that offers basic protection but falls short of meeting the demands of modern vehicles. I recommend prioritizing SP for vehicles manufactured after 2015 to extend engine life; for older cars, SN is sufficient and more cost-effective. Don't forget to check that the oil viscosity matches your vehicle model, such as 0W-20. Regular oil changes are essential—inspect every 5,000 to 10,000 kilometers to avoid major engine overhauls.
