What is the identification mark for fully synthetic engine oil?
2 Answers
Fully synthetic engine oil does not have a specific identification mark. If it is fully synthetic, the bottle will be directly labeled with the words "Fully Synthetic". If it only says "Synthetic", "Advanced Synthetic", it is definitely semi-synthetic. If it is labeled as "Premium Oil" or "XXX Special Premium", it must be mineral oil. Below are detailed explanations about the benefits of using fully synthetic engine oil: Low evaporation loss: Synthetic oil is generally a pure compound with a narrow boiling point range, and its evaporation loss is much lower than that of mineral oil, which can reduce fuel consumption, decrease exhaust emissions, and extend the service life of catalytic converters. In addition, compared to traditional mineral oil-based engine oils, synthetic oils also have excellent chemical stability, good radiation resistance, high oil film strength, and low foaming characteristics. Therefore, high-end vehicles generally choose synthetic oil. Strong high-temperature oxidation resistance: The thermal oxidation stability of synthetic oil is far superior to that of mineral oil-based engine oils, meaning it has a lower tendency to produce acidic substances and sludge due to oxidation. Under various harsh operating conditions, it can provide appropriate lubrication and effective protection for the engine, thus having a longer service life and ensuring the performance stability of the oil over long-term use. In the same working environment, synthetic oil lasts much longer than mineral oil, so although the cost is higher, when compared to the number of oil changes required, it is not significantly more expensive than mineral oil.
When I first chose fully synthetic oil, I specifically researched the labeling issues. Now I’m sharing my insights: The front of the packaging usually features prominent labels like ‘Fully Synthetic’ or ‘100% Synthetic,’ which are the most basic indicators, meaning it’s 100% chemically synthesized oil. I also pay close attention to the SAE viscosity numbers, such as 5W-30—this indicates faster performance during cold starts (0W or 5W), while the 30 represents the oil’s thickness at high temperatures. The API certification is crucial too; the circular logo with ‘API SP’ or the newer ‘API SP Plus’ confirms the oil has passed rigorous tests for engine protection against carbon buildup and wear. Some brands also include manufacturer approvals, like dexos for General Motors vehicles. I remember once overlooking the API label, and the oil turned out to be unsuitable—my engine noise increased. Properly labeled full synthetic oil can extend oil change intervals up to 10,000 kilometers, saving money and hassle. In short, these markings ensure quality, so always check the bottle details carefully when buying oil.
