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What is the API-SP grade of engine oil?

2 Answers

DelManuel

07/29/25 5:24am

API-SP engine oil is the highest quality grade of oil suitable for gasoline engines. API refers to the American Petroleum Institute, 'S' indicates that the oil is only suitable for gasoline engines, and 'P' represents the quality grade of the oil, with 'P' being the highest level in the oil grading system. Engine oils are categorized into those suitable for gasoline engines and those for diesel engines, distinguished by 'S' and 'C' respectively. Oils starting with 'S' are specifically for gasoline engines, with grades including SA, SB, SC, SD, SE, SF, SG, SH, SJ, SL, SM, SN, and SP. Diesel engine oils start with 'C', with grades such as CA, CB, CC, CD, CE, CF, CF-4, CG-4, CH-4, CI-4, and CJ-4. For both gasoline and diesel vehicles, each subsequent letter indicates a higher grade of engine oil, with generally superior performance compared to the previous one. Engine oil serves to lubricate and reduce friction, assist in cooling, seal against leaks, prevent rust and corrosion, and act as a shock absorber. When selecting engine oil, refer to the vehicle's maintenance manual, which typically specifies the required oil grade. It is advisable to choose high-quality oil from reputable manufacturers, preferably specifically designed for your vehicle. Avoid using counterfeit or substandard oils, as they may accelerate engine wear and shorten the engine's lifespan.

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AniyahRose

08/12/25 8:59am

I've been driving for over a decade and pay special attention to oil grades. API SP is a new high-quality standard introduced by the American Petroleum Institute in recent years, designed for modern vehicles. Compared to the previous SN grade, it provides better engine protection against issues like low-speed pre-ignition, making your car more fuel-efficient and durable. I believe it's crucial to choose the right oil grade when purchasing – SP isn't always the best choice unless recommended for your vehicle. For newer turbocharged cars, SP is quite suitable. After switching to SP oil, I noticed the engine runs smoother, acceleration is more responsive, and noise is reduced. But don't just take my word for it – check your owner's manual to see which oil grade is recommended. When changing oil, make sure the product has all necessary certifications; don't compromise quality to save money and risk engine damage. Overall, API SP is currently one of the more reliable options available.

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