New Polyfunctional Lubricating Oil Additive Based on a Sulfur-Containing Derivative of 2,6-Dimethylphenol

New dialkyldithio derivatives of 2,6-dimethylphenol have been synthesized and characterized. The multifunctional properties have been studied for the first time for these compounds as additives to lubricating oils in friction and wear processes under boundary friction conditions, as inhibitors of high-temperature oxidation of hydrocarbons, and as protectors of metal surfaces. It was determined that even a 0.5 wt % concentration of the synthesized additives in lubricating oils contain more than doubles anti-wear properties. It was shown that the additives exhibit a complex antioxidant effect and high efficiency at all stages of the oxidation process, and even at ultralow concentrations (0.005 wt %), their ability to resist oxidation exceeds widely used analogues. The new additives are of significant interest to modern lubricant science and can be used in motor oil formulations and other lubricants.