sulphonate detergent comprises a mixture of a 300 tbn or higher alkaline earth metal sulphonate detergent having a metal ratio of 10 to 40 and a tbn of less than 100 or 85 or less alkaline earth metal sulphonate detergent having a metal ratio of 1 to 6 or 1 to 5 the sulphonate detergent provides no more than 50 of the total base number derived from a detergent and the lubricating composition has a total base number of 10 to 25 mg koh g in one embodiment the disclosed technology provides a lubricating composition consisting essentially of 0 1 wt to 4 wt 0 1 to 3 wt or 0 2 wt to 2 wt or 0 3 wt to 1 wt of a borated polyisobutylene succinimide dispersant wherein the polyisobutylene from which the borated polyisobutylene succinimide may be derived has a number average molecular weight of 550 to 2500 or 550 to 1150 and 0 1 wt to 6 wt or 0 2 wt to 5 wt 0 5 wt to 4 wt 0 5 wt to 3 wt of a non borated polyisobutylene succinimide wherein the polyisobutylene from which polyisobutylene succinimide may be derived has a number average molecular weight of 350 to 5000 or 750 to 3000 or 1350 to 2500 an alkali earth metal sulphonate detergent present in an amount to provide at least 1 wt sulphonate soap to the lubricating composition an alkaline earth metal phenol based detergent present in amount to provide at least 3 5 wt phenol containing soap to the lubricating composition wherein the phenol based detergent may be chosen from a non sulphur containing phenate a sulphur coupled phenate.