abstract |
It is a lubricating composition of a lubricating viscosity oil and a phosphite ester reaction product of a monomeric phosphoric acid or an ester thereof with a first alkylenediol having two hydroxy groups in a ratio of 1.4 or 1. , 5 or 1,6 and a second alkyl substituted diol which is a substituted 1,3-propylenediol exhibits good wear and frictional performance. |