What are the benefits of fully synthetic engine oil?

[DiColin]

Using fully synthetic engine oil offers the following advantages: 1. Synthetic oil is typically a pure compound with a narrow boiling point range, resulting in significantly lower evaporation loss compared to mineral oil. This helps reduce fuel consumption, decrease exhaust emissions, and extend the service life of catalytic converters. 2. Synthetic oil has far superior thermal oxidation stability compared to mineral-based engine oil, meaning it is less prone to forming acidic substances and sludge due to oxidation. Under various harsh operating conditions, it provides appropriate lubrication and effective protection for the engine, thereby offering a longer service life. 3. Synthetic engine oil has a higher viscosity index than mineral oil, with less viscosity variation due to temperature changes. At the same high-temperature viscosity, most synthetic oils have lower pour points (or freezing points) and lower low-temperature viscosity compared to mineral oils. For the same oil film requirements, synthetic oil can form the necessary protection with lower viscosity, achieving the goal of engine protection.