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

[SanMaggie]

The differences between SP and SN engine oil grades are as follows: 1. Viscosity level (phosphorus content): SN oil has relatively lower phosphorus content; and in terms of viscosity comparison between SN and SP, SP has a slightly higher viscosity value. 2. Different advantages: SP oil provides a stronger oil film than SN, offering better protective performance. Additionally, SP shows stable improvements over SN in terms of noise reduction, fuel consumption, and acceleration performance. Methods for selecting engine oil are as follows: 1. Choose the appropriate oil based on engine type: Naturally aspirated engine models can use mineral oil, which fully meets the needs of such engines. Turbocharged engines should opt for semi-synthetic or fully synthetic oil to better protect the engine. 2. Select according to oil specifications: Since each car brand's engine is different, the easiest way is to refer directly to the vehicle's manual, which provides the most standard and accurate method.