| abstract |
(57) [Abstract] [Purpose] To provide a functional fluid containing an amine salt of sulfonic acid, which exhibits rust resistance, corrosion resistance and extreme pressure-wear protection properties. [Structure] A functional fluid containing (a) an oil of lubricating viscosity; (b) a reaction product of an amine and a sulfonic acid; and (c) a compound having the following structure: Where each X is independently sulfur or oxygen, provided that at least one X is sulfur, where each R is independently a hydrocarbyl or substituted hydrocarbyl group. |