What is the SN oil grade?

2 Answers
VonMalia
07/24/25 3:11am
SN is classified as the second-tier gasoline engine oil grade in the API quality classification. The functions of engine oil are: 1. Reduce friction and high temperatures; 2. Cool down the engine; 3. Clean and remove deposits; 4. Absorb shocks and vibrations; 5. 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 engine oil is: 1. Lift the vehicle with a jack, locate and loosen the drain plug to release the oil; 2. Unscrew the oil filter and place a container beneath it; 3. Replace with a new oil filter and add new engine oil.
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Louis
08/10/25 10:48pm
I've been driving for over a decade and know the SN oil grade quite well. It's a standard set by the American Petroleum Institute specifically for gasoline-powered vehicles. Simply put, SN provides better engine protection, such as anti-oxidation, reducing sludge and deposits, and also helps control emissions, especially suitable for older models around 2010. I remember after using SN oil for my first car's maintenance, the engine ran much smoother, with reduced noise and stable fuel consumption. Although SP is now a newer grade supporting stricter emissions, SN is still reliable for many vehicles—the key is to check what your car's manual recommends. Choosing the right grade during maintenance is crucial; don't go for cheap, wrong oil as it can damage engine lifespan. Generally, SN oil has broad compatibility, offers good value for money, and is suitable for daily commuter cars.
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