Detergent dispersant and lubricating oil composition

A detergent dispersant containing a nitrogen-containing compound represented by the following formula (1),

• where:
• X represents one of N (nitrogen), O (oxygen), C (carbon) and H (hydrogen);
• R1, R2, R3, R4, R5 and R6 independently represent hydrogen atoms or hydrocarbon groups that are allowed to have at least one substituent or structure selected from amino groups, amide groups, hydroxyl groups, ether groups and carbonyl groups, the hydrocarbon group having 10 to 200 carbon atoms;
• R1, R2, R3, R4, R5 and R6 are allowed to be mutually the same or different, but all of those are not hydrogen at the same time;
• R1 and R2, R4 and R5, and R2 and R4 are allowed to respectively form cyclic structures;
• and R6 is not present when X is N, R5 and R6 are not present when X is O, and R4, R5 and R6 are not present when X is H.