| abstract |
A base oil, the formula (III):? [?? ??? Y CO [O A CO] n Z R +] m pX q (Y is hydrogen or optionally substituted hydrocarbyl group, A is a divalent hydrocarbyl optionally substituted A group, n is 1 · 100, m is 1 · 4, q is 1 · 4, p is an integer such that pq = m, Z is an optionally substituted divalent bridging group bonded to a carbonyl group via a nitrogen atom, R + is an ammonium group, X q? is a lubricating composition comprising one or more poly (hydroxycarboxylic acid) amide salt derivatives having an anion), and one or more detergents, sulfonate and salicylate A lubricating composition wherein the soap concentration imparted by a detergent selected from detergents or mixtures thereof is less than 3.75 millimoles per weight percent poly (hydroxycarboxylic acid) amide salt derivative. [Selection figure] None |