Synthetic transmission oils are lubricants whose base component is not obtained by direct crude oil refining, but is manufactured through a chemical process, i.e., synthesis. As a result, the oil molecules have a uniform size and structure, which gives them precisely defined properties. The most common base oils include polyalphaolefins, abbreviated as PAO, or esters. Compared to mineral oils, they provide better temperature stability. They remain fluid even at low temperatures, which facilitates shifting and protects the transmission during cold starts. At high temperatures, they maintain a stable lubricating film, thereby preventing excessive wear of components. Their chemical composition is also more resistant to oxidation and degradation, which allows for longer change intervals.