A composition of matter comprising an amine acylated with a hydrocarbyl
group substituted carboxylic acylating agent containing an average of
from 1.3 to 1.6 groups derived from .alpha.,.beta.-unsaturated carboxylic
compounds per M.sub.n of the hydrocarbyl group, wherein the hydrocarbyl
group has M.sub.n determined by GPC ranging from 1500 to 3000, the amine
comprises polyamine bottoms and said acylated amine has total base number
(TBN) ranging from 17 to 35. A method for preparing the composition,
lubricating oils containing the composition and, in another embodiment,
lubricating oil compositions of this invention further comprising a metal
overbased sulfonate detergent.