A lubricating composition comprising an oil of lubricating viscosity and 0.01 wt% to 5 wt % of an ashless thiocarbamate compound having an optionally-substituted hydrocarbyl group on an S-atom and an optionally-substituted hydrocarbyl group on an N-atom, wherein the ashless thiocarbamate compound having an optionally-substituted hydrocarbyl group on an S-atom and an optionally-substituted hydrocarbyl group on an N-atom is represented by the formula: wherein R 1 is an optionally-substituted hydrocarbyl group containing 2 to 60, or 4 to 30, or 6 to 20 carbon atoms, or a heterocycle or substituted equivalents thereof; and R 2 is a hydrocarbyl group containing 2 to 60, or 4 to 30, or 6 to 20 carbon atoms, or a heterocycle or substituted equivalents thereof, with the proviso that R 2 is free of a nitrogen-containing heterocycle, or wherein the ashless thiocarbarnate compound having an optionally-substituted hydrocarbyl group on an S-atom and an optionally-substituted hydrocarbyl group on an N-atom is represented by the formula: wherein Y is >O, or >S, or >NH or >NR 5, typically Y is >O, or >S; R 2 is a hydrocarbyl group containing 2 to 60, or 4 to 30, or 6 to 20 carbon atoms, or a heterocycle or substituted equivalents thereof, with the proviso that R 2 is free of a nitrogen-containing heterocycle; R 3 is a hydrocarbylene group, typically containing 1 to 16, or 2 to 10, or 4 to 8, such as 6 carbon atoms, or a heterocycle or substituted equivalents thereof; R 4 is a hydrocarbyl group containing 2 to 60, or 4 to 30, or 6 to 20 carbon atoms, or a heterocycle or substituted equivalents thereof; R 5 is a hydrocarbyl group containing 1 to 30, or 1 to 20, or 1 to 10, or 1 to 5 carbon atoms; and the heterocycle is a pyrrole, a pyrrolidine, a pyrrolidinone, a pyridine, a piperidine, a pyrone, a pyrazole, a pyrazine, pyri-dazine, a 1,2-diazole, a 1,3-diazole, a 1,2,4-triazole, a benzotriazole, a quinoline, an indole, an imidazole, an oxazole, an oxazoline, a thiazole, a thiophene, an indolizine, a pyrimidine, a triazine, a furan, a tetrahydrofuran, a dihydrofuran, or mixtures thereof. wherein R 1 is an optionally-substituted hydrocarbyl group containing 2 to 60, or 4 to 30, or 6 to 20 carbon atoms, or a heterocycle or substituted equivalents thereof; and R 2 is a hydrocarbyl group containing 2 to 60, or 4 to 30, or 6 to 20 carbon atoms, or a heterocycle or substituted equivalents thereof, with the proviso that R 2 is free of a nitrogen-containing heterocycle, Y is >O, or >S, or >NH or >NR 5, typically Y is >O, or >S; R 2 is a hydrocarbyl group containing 2 to 60, or 4 to 30, or 6 to 20 carbon atoms, or a heterocycle or substituted equivalents thereof, with the proviso that R 2 is free of a nitrogen-containing heterocycle; R 3 is a hydrocarbylene group, typically containing 1 to 16, or 2 to 10, or 4 to 8, such as 6 carbon atoms, or a heterocycle or substituted equivalents thereof; R 4 is a hydrocarbyl group containing 2 to 60, or 4 to 30, or 6 to 20 carbon atoms, or a heterocycle or substituted equivalents thereof; R 5 is a hydrocarbyl group containing 1 to 30, or 1 to 20, or 1 to 10, or 1 to 5 carbon atoms; and the heterocycle is a pyrrole, a pyrrolidine, a pyrrolidinone, a pyridine, a piperidine, a pyrone, a pyrazole, a pyrazine, pyri-dazine, a 1,2-diazole, a 1,3-diazole, a 1,2,4-triazole, a benzotriazole, a quinoline, an indole, an imidazole, an oxazole, an oxazoline, a thiazole, a thiophene, an indolizine, a pyrimidine, a triazine, a furan, a tetrahydrofuran, a dihydrofuran, or mixtures thereof.