What does SJ10W-30 engine oil represent?
3 Answers
Engine oil SJ10W-30 is an all-season oil, where 10W indicates that the minimum starting temperature of this oil is -25°C, and 30 represents high-temperature fluidity. The larger the number (the higher the applicable maximum temperature), the wider the applicable temperature range. Below is some information about engine oil: 1. Composition: Engine oil consists of two parts: base oil and additives. Base oil is the main component of lubricating oil, determining its basic properties, while additives are an important part of lubricating oil. 2. Types of engine oil: The winter oil grades in the SAE lubricating oil viscosity classification are: 0W, 5W, 10W, 15W, etc. The symbol W stands for winter, and the smaller the number before W, the lower the low-temperature viscosity and the lower the applicable minimum temperature. The summer oil grades in the SAE lubricating oil viscosity classification are: 20, 30, 40, 50. The larger the number, the higher the viscosity and the higher the applicable maximum temperature.
As a regular car enthusiast, let me explain the SJ 10W-30 engine oil, which primarily indicates its performance grade and viscosity standard. The 'SJ' part represents the service classification set by the American Petroleum Institute, suitable for gasoline engines manufactured before 2001, indicating effective protection against carbon deposits and corrosion. In '10W-30', the 'W' stands for winter, and the number '10' suggests good cold-start performance, suitable for environments as low as -25°C, while '30' indicates moderate viscosity at high temperatures, protecting engine components like pistons and bearings. Choosing this oil depends on your vehicle's manual—if you own an older model, say some Toyotas or Fords from the 1990s, it aligns better with the engine design. However, newer vehicles may benefit more from higher-grade oils like SP for better fuel efficiency. Remember, the oil change interval is typically between 5,000 to 8,000 kilometers; don't exceed it to avoid increased engine wear. Checking the oil dipstick yourself is also straightforward. Overall, this oil is quite practical in temperate regions, balancing cold-start capability and high-temperature protection, but avoid using it in diesel or hybrid vehicles.
After years of driving, I've learned how to choose engine oil. The SJ10W-30 brand means it's suitable for older gasoline engines. SJ is an older specification, focusing on basic protection, while the 10W-30 viscosity ensures quicker starts in cold winters without causing engine stalling, and the 30-grade provides stable cooling in summer. Don't assume all cars can use it; it's not suitable for newer turbocharged vehicles, as it may lead to higher fuel consumption or increased emissions. I've used this oil myself and noticed reduced engine noise after an oil change, especially during long trips where the lubrication effect is evident. I recommend car owners check the oil color during regular maintenance—if it turns black or becomes thin, change it immediately to avoid engine damage. Economically, this oil is relatively cheap, but don't compromise by using the wrong viscosity, as it could cause severe engine wear, requiring major repairs and compromising safe driving. For daily driving in regions with variable temperatures, like northern winters, it's a reliable option.
