| abstract |
An object of the present invention is to provide thiodicarboxylic acid esters having high long-term storage stability without inhibiting the antioxidative performance and abrasion resistance performance of thiodicarboxylic acid esters. In order to achieve the said objective, this invention contains the compound (A) represented by following formula (1), and the compound (B) represented by following formula (2), and is an acid value of 0.01-0.4 mgKOH / g. It provides a lubricant additive composition, characterized in that. In formula, R < 1> and R < 4> respectively independently represents a C6-C18 hydrocarbon group, R < 2> and R < 3> respectively independently represents a C1-C4 alkylene group. In formula, R < 5> represents a C6-C18 hydrocarbon group, R < 6> and R < 7> respectively independently represents a C1-C4 alkylene group. |