The present invention provides a lubricating oil additive with excellent cleaning performance which does not include metal components such as calcium or magnesium, and a lubricating oil composition containing the same. The lubricating oil additive according to the present invention is characterized by containing a quaternary ammonium salt having a base number of at least 10 mgKOH/g. Examples of such a quaternary ammonium salt include quaternary ammonium salts obtained by subjecting counter anions in cationic surfactants such as tetraalkylammonium chloride and tetraalkylammonium sulfate to salt-exchange.
本发明提供了一种不含诸如
钙或
镁等
金属成分的具有优异清洁性能的润滑油添加剂,以及含有该添加剂的润滑油组合物。根据本发明的润滑油添加剂的特点是含有碱基数至少为 10 mgKOH/g 的季
铵盐。这种季
铵盐的例子包括通过对
阳离子表面活性剂(如
氯化四烷基
铵和
硫酸四烷基
铵)中的反阴离子进行盐交换而得到的季
铵盐。