| abstract |
The additive multipurpose engine oil composition and engine lubricant compositions comprise, in addition to the base oil, 1.5 to 55 wt. The additive compositions are constituted by components "A", "B" and optionally "C", each of which consists of one or more additives, and may further comprise a diluent. The "A" component of the additive composition consists of a polyfunctional, ashless detergent-dispersing additive composition consisting of polymeric components prepared by reacting a polyolefin derivative, preferably a polyisobutylene derivative modified by interaction with one or more dicarboxylic acids and / or dicarboxylic acid anhydrides. one or more vinyl comonomers with amino-, imino- or hydroxy-containing compounds, wherein the polyolefin chain carries an average of 1.6 to 20 acidic groups and the content of its molecules with more than one acidic group is greater than 25% by weight, wherein the derivative can be an imide, amide or esteramide and / ii / a customary alkenyl succinate derivative such as an imide, ester or esteramide. The "B" component of the additive composition consists of one or more conventional additives such as detergents-dispersants, antioxidants, friction modifiers, anti-wear additives, corrosion inhibitors, suds reducing additives and freezing point additives, and the "C" component of the additive composition from one or more customary viscosity modifiers of viscosity index enhancers |