What is the difference between SN grade and SM grade engine oil?
1 Answers
The differences between SN grade and SM grade engine oil are: 1. Different quality grades: SN grade engine oil has higher quality grade; SM grade engine oil has lower quality grade. 2. Different performance: SN grade engine oil has high-temperature detergency; SM grade engine oil has oxidation stability and anti-wear properties. 3. Different oil types: SN grade engine oil is mainly full synthetic oil; SM grade engine oil is mainly semi-synthetic oil. 4. Different environmental protection levels: SN grade engine oil has higher environmental protection level; SM grade engine oil has lower environmental protection level. Engine oil is engine lubricant, and engine oils of different brands and grades cannot be mixed.