| abstract |
(57) Abstract: A low phosphorus passenger car motor oil comprising an oil of lubricating viscosity as a major component and a tri-metallic detergent mixture as a minor component. The three metal detergent mixture comprises at least one calcium overbased metal detergent, at least one magnesium overbased metal detergent and at least one sodium overbased metal detergent, wherein the three metal detergent mixture is an oil composition comprising a three metal detergent mixture. Is present in the oil composition in an amount such that the total TBN contributed by the three metal detergent mixture is from about 8% to about 42% of the total TBN contributed by the three metal detergent mixture. %, The magnesium overbased detergent contributes from about 29% to about 60% of the total TBN contributed by the three metal detergent mixture, and the sodium overbased detergent contributes by the three metal detergent mixture. Contributes from about 15% to about 64% of the total TBN. |