What is the classification of full synthetic engine oil?
3 Answers
Currently, full synthetic engine oil is mainly classified as SN grade. The API (American Petroleum Institute) classification system for engine oil includes SA, SB, SC, SD, SE, SF, SG, SH, SJ, SL, SM, and SN grades, with SN being the highest grade available today. Below is an introduction to engine oil classifications: 1. Mineral oil: Mineral oil is extracted from crude oil and is relatively viscous and inexpensive. It provides basic protection and can be considered the most fundamental type of engine oil. 2. Synthetic oil: Synthetic oil is artificially produced through chemical processes. Full synthetic oil offers the best performance. For vehicles with turbocharged (T) engines, using full synthetic oil ensures excellent smoothness and cleanliness, with a longer replacement interval of up to 1 year or 10,000 kilometers. 3. Semi-synthetic oil: Semi-synthetic oil is a blend of synthetic and mineral oils, offering performance that falls between the two. Its price and replacement cycle are also intermediate. For ordinary naturally aspirated engines, semi-synthetic oil is a suitable choice.
As an automotive technology enthusiast, I'm obsessed with understanding the details of full synthetic oil grades. Grades mainly refer to API performance ratings and SAE viscosity grades. For example, API SP or SN indicates better engine protection standards, reducing sludge and deposits; SAE numbers like 5W-30 represent viscosity indexes, meaning strong low-temperature fluidity in winter and thick lubrication at high temperatures in summer. I believe high-grade synthetic oils offer superior purity and strong anti-aging properties, significantly improving fuel efficiency and engine lifespan, especially suitable for modern direct-injection or turbocharged engines. When choosing, always refer to your vehicle's manual recommendations—don't arbitrarily switch to lower grades to save money. Long-term use of incorrect oil can accelerate wear and even cause failures. I always remind beginners to start with the manufacturer's standards and change oil regularly every 5,000 kilometers. Although synthetic oil is more expensive, the return on investment is high, providing greater peace of mind and convenience while driving.
In my daily driving, paying attention to the grade of full synthetic engine oil is all about saving money and hassle. The grade refers to the API symbol and SAE numbers on the oil bottle, such as SP grade representing advanced protection, and SAE like 0W-20 indicating easy cold starts and no leaks in hot weather. I believe it's crucial for average car owners to follow the vehicle manual to select the correct grade, as the wrong viscosity can cause engine wear or increased fuel consumption. Synthetic oil has better cleaning power, keeping the car running smoothly, and reducing long-term repair costs makes it more cost-effective. It's recommended to check every six months or 8,000 kilometers—don't just look at the price, higher grades allow for longer oil change intervals, saving both time and money. Simply put, matching the right grade ensures healthy engine operation and reduces unexpected expenses.
