The role and significance of singlet oxygen in the degradation of engine oils

The potential role of singlet oxygen in the oxidation, and subsequent degradation, of engine oils was investigated using spectroscopic steady-state and singlet oxygen lifetime measurements. Three currently commercially available antioxidants; a sterically hindered amine (aminic), a sterically hindered phenol (phenolic) and sulfurized olefin, all provided by Lubrizol, were tested alongside previously documented singlet oxygen quenchers; α-tocopherol and squalene. [Continues.]