| abstract |
This invention relates to a low-viscosity lubricating oil and functional fluid compositions, comprising: a major amount of an oil having a kinematic viscosity of up to about 4 cST at 100°C; and a minor antiwear amount of (A) a compound represented by the formula R1RN-C(X)S-(CR3R4)aZ (A-I) wherein in Formula (A-1), R1, R, R3 and R4 are independently hydrogen or hydrocarbyl groups, provided that at least one of R1 and R is a hydrocarbyl group; X is O or S; a is zero, 1 or 2; and Z is a hydrocarbyl group, a hetero group, a hydroxy hydrocarbyl group, an activating group, or a -(S)bC(X)-NR1R group wherein b is zero, 1 or 2; provide that when a is 2, Z is an activating group; and when a is zero, Z can be an ammonium, amine or metal cation. In one embodiment this composition further comprises (B) a phosphorus compound. |