DISPERSANT AND DETERGENT SYSTEMS FOR IMPROVED MOTOR OIL PERFORMANCE

To provide a passenger car motor oil lubricant composition suitable for improving at least one of deposits, sludge, oxidation, and wear.SOLUTION: A passenger car motor oil lubricant composition comprises: a blend of base oils with lubricant viscosity comprising one or more API Group II base oils, and one or more API Group III base oils and/or one or more API Group IV base oils; an oil-soluble nitrogen-containing dispersant additive comprising (i) at least one boronated oil-soluble nitrogen-containing dispersant additive, and (ii) at least one non-boronated oil-soluble nitrogen-containing dispersant additive; and a metal-containing detergent additive comprising (i) at least one calcium-containing detergent additive, and (ii) at least one magnesium-containing detergent additive, wherein a ratio of dispersant boron, dispersant nitrogen, and dispersant TBN of the passenger car motor oil lubricant composition, as defined by the dispersant formula B/(N*TBN), is less than 0.25.SELECTED DRAWING: Figure 1 【課題】堆積物、スラッジ、酸化、及び摩耗のうちの少なくとも１つを改善するのに適した、乗用車モーターオイル潤滑組成物を提供する。【解決手段】１種以上のＡＰＩグループＩＩ基油、並びに１種以上のＡＰＩグループＩＩＩ基油及び／又は１種以上のＡＰＩグループＩＶ基油、を含む、潤滑粘度の基油のブレンドと、（ｉ）少なくとも１種のホウ素化油溶性窒素含有分散添加剤、及び（ｉｉ）少なくとも１種の非ホウ素化油溶性窒素含有分散添加剤を含む、油溶性窒素含有分散添加剤と、（ｉ）少なくとも１種のカルシウム含有洗浄添加剤、及び（ｉｉ）少なくとも１種のマグネシウム含有洗浄添加剤を含む、金属含有洗浄添加剤と、を含み、前記乗用車モーターオイル潤滑組成物の、分散剤式Ｂ／（Ｎ＊ＴＢＮ）によって規定される、前記分散剤ホウ素、前記分散剤窒素、及び前記分散剤ＴＢＮの比が０．２５未満である、乗用車モーターオイル潤滑組成物。【選択図】図１