| abstract |
(57) [Problem] To have excellent performance and excellent physical properties, In particular, to provide a Mannich base composition which is highly effective in controlling deposits on intake valves in an internal combustion engine. A (i) (a) Number aliphatic hydrocarbyl substituent derived average molecular weight of from about 500 to about 3000 range of polyolefin and (b) at least one having both C 1 to 4 alkyl on the ring Two disubstituted hydroxyaromatic compounds, (ii) certain secondary amines, and the like. |