| abstract |
(57) [Summary] [Purpose] While reducing the phosphorus concentration to 0.12% by weight or less, and even to about half of that, the same wear resistance and oxidation as engine oil using conventional zinc dialkyldithiophosphates. Provided are an engine oil additive exhibiting prevention performance, an additive composition, and an engine oil for automobiles (lubricating oil composition for automobiles). [Structure] General formula (I): (However, R 1 , R 2 , R 3 and R 4 each represent an alkyl group having 1 to 18 carbon atoms which may be the same or different from each other, and (X) represents S, SS, S- CH 2 -S, S-CH 2 CH 2 -S, S-CH 2 CH 2 CH 2 -S or S-CH 2 CH (CH 3 ), represents a -S. ) An engine oil additive comprising an alkylthiocarbamoyl compound represented by the formula (1), an additive composition, and an engine oil composition containing the additive. |