| abstract |
To provide a lubricating oil additive containing a blend of vicinal diol and a specific detergent, which is a low-viscosity base oil exhibiting improved fuel efficiency. The lubricating oil additive comprises a major amount of a base oil of lubricating viscosity; a friction selected from the group consisting of C 10 -C 30 alkane 1,2-diol and C 10 -C 30 alkene 1,2-diol. An overbased alkyl hydroxybenzoic acid alkaline earth metal salt detergent having a metal ratio of less than 3.0; and an overbased calcium alkyl sulfonate or overbased alkyl hydroxy having a metal ratio of 3.5 or greater Contains calcium benzoate. |