What does SN grade mean for motor oil?
2 Answers
Motor oil SN grade refers to the quality classification of engine oil. The oil grades include: SG, SJ, SL, SM, and their functions are: 1. To reduce friction and high temperatures; 2. To cool and lower temperatures; 3. To clean and remove impurities; 4. To absorb shocks and cushion impacts; 5. To prevent rust and corrosion. Engine oil, also known as motor lubricant, is composed of base oil and additives. The base oil is the main component of lubricating oil, determining its fundamental properties, while additives compensate for and improve any deficiencies in the base oil's performance. The method for changing car engine oil is: 1. Use a jack to lift the vehicle, locate and unscrew the drain plug to release the oil; 2. After removing the oil filter, place a container beneath it; 3. Replace with a new oil filter and add new engine oil.
Last time I changed my engine oil, I specifically researched these letters. SN represents the API (American Petroleum Institute) motor oil classification standard. The 'S' prefix indicates oil specifically for gasoline engines, while 'N' is currently the second-newest grade, with SP being the latest. SN-grade oil has higher requirements for engine cleanliness and high-temperature anti-wear protection, particularly in reducing phosphorus content to protect exhaust treatment systems. Most mid-to-high-end cars on the market today use SN or SP grade oil. As someone who's been driving for 8 years, I pay special attention to selecting oil that's at least SL grade or above. Choosing the correct grade is crucial - using the wrong oil may lead to increased engine carbon deposits or even affect the lifespan of the catalytic converter. I recommend directly checking your vehicle's manual to confirm the manufacturer's recommended grade specifications.
