What is the most common type of synthetic oil?

The most common type of synthetic oil is known as PAO, which stands for Polyalphaolefin. This type of synthetic lubricant is widely used in various applications due to its excellent thermal stability, low temperature flow characteristics, and effective lubricating properties. PAOs are derived from the polymerization of alpha-olefin compounds and are particularly favored in automotive and industrial lubricants because they offer a favorable balance of performance and cost.

PAOs also exhibit a high viscosity index, which means they maintain their viscosity better across a range of temperatures compared to conventional mineral oils. This stability helps in improving engine efficiency and prolonging equipment life.

Other types of synthetic oils like PAG (Polyalkylene Glycol), silicon-based oils, and diesters have specific applications, but they are not as commonly used as PAOs for general lubrication needs. PAGs are beneficial in specific scenarios involving water-containing fluids, while silicon-based oils might be designated for high-temperature applications. Diesters are commonly used in specialized applications such as aviation but are not as widely used as PAOs in most industrial or automotive settings.