{TAIL ~ Silver protection} in lubricant compositions is afforded by {HEAD ~ the combination} of organo sulfur compounds and hydrocarbon substituted 1,2,4 triazoles, the latter being obtained by reaction of a substantially aliphatic, substantially saturated hydrocarbon substituted dicarboxylic acid with an aminoguanidine compound 
{ TAIL ~ Silver protection } in lubricant compositions is afforded by { HEAD ~ the combination } of organo sulfur compounds and hydrocarbon substituted 1,2,4 triazoles , the latter being obtained by reaction of a substantially aliphatic , substantially saturated hydrocarbon substituted dicarboxylic acid with an aminoguanidine compound
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