Low saps lubricating oil composition comprising nitrogen and boron

Abstract From the Canadian patent

A low SAPS lubricating oil composition having up to 0.3 wt.% sulphur up to , 0.08 wt.% phosphorus, and a sulphated ash content up to 0.80 wt.% comprising at least , one nitrogen-containing dispersant the dispersant providing to the oil a nitrogen content , of at least 0.075 wt.% nitrogen the dispersant having a polyalkenyl backbone which has , a number average molecular weight range of about 900 to 3000; and an oil soluble or oil , dispersible source of boron which is a boron containing dispersant present , in an amount , so as to provide a ratio of wt% nitrogen to wt% boron in the oil composition of about 3:1 , to 5:1. These dispersants are in admixture with a major amount of an oil of …