What grade is SM engine oil?

[NorahAnn]

SM engine oil quality grade is second only to SN, and it is also one of the three most common grades of engine oil currently available. Engine oil grades: 1. Definition: API grades represent the quality grades of engine oil. It uses simple codes to describe the working capability of engine oil. Engine oil grades are classified into SA, SB, SC, SD, SE, SF, SG, SH, SJ, SL, SM, and SN grades. The further back the letter is, the higher the grade. 2. Highest grade: SN grade is currently the highest grade of engine oil. SJ was the standard in the 1990s, SL was the standard in 2001, SM was the standard in 2004, and SN was the standard in 2010. Therefore, SM is only one grade lower than SN, and its oil quality is quite good. Most international brand engine oils are above SF grade.

[MacDerek]

SM oil is one of the performance classifications set by the American Petroleum Institute (API), specifically designed for gasoline engines. This classification was introduced around 2004 with the primary goal of enhancing the oil's oxidation resistance, anti-wear capabilities, and detergency/dispersancy properties, helping to reduce carbon deposits and corrosion inside the engine. Compared to older classifications like SL, SM offers better protection and is suitable for vehicle models from 2004 and earlier. While newer classifications such as SN and SP are now available on the market, SM remains a cost-effective choice for older vehicles. When changing oil, I recommend checking your vehicle's owner's manual. If it specifies SM or a similar classification, you can confidently use it to extend your engine's lifespan. Having worked on many older cars myself, I've observed that engines run more smoothly and with reduced noise after switching to SM oil. Regular oil changes, approximately every 8,000 kilometers, are sufficient.

[Yvonne]

As a car owner, I drive a pre-2010 older vehicle and often choose SM-grade motor oil. This grade is a tier within the API standards, representing strong overall protection for the engine and preventing excessive wear. I use it because the older car's manual recommends SM-grade, and after several years of use, I've noticed quicker starts and stable fuel consumption. The SM grade is clearly labeled on the oil container, such as in the circular API logo. Although it has now been upgraded to SN, SM-grade is still perfectly fine and cost-effective for older cars. In daily maintenance, I believe the key is matching the vehicle's needs and avoiding lower-grade oils. On average, changing the oil every six months or every 10,000 kilometers is simple and safe. I've tried different brands of SM-grade oil, and they all perform reliably with noticeable engine cleanliness.

[StEmilia]

SM oil is the API performance grade for gasoline engine oils, emphasizing durability and protective effects. Technically, it has passed specific tests to ensure oxidation resistance, sludge deposit prevention, and reduced engine friction. The API introduced SM in 2004 to replace SL, aiming to improve compatibility with older vehicles. While higher grades like SN exist now, SM remains suitable for models around 2010. For usage, I recommend selecting the correct viscosity grade while considering the API rating to prevent engine overheating and aging. Regular oil condition checks during maintenance can ensure optimal performance.