Patent ID: 11932825
Assignee: THE LUBRIZOL CORPORATION
Field: Basic materials chemistry (Chemistry)
Classification: CPC C | IPC C

Claim 0:
1. An internal combustion engine lubricating composition comprising:
oil of lubricating viscosity comprising at least 50 weight percent of a Group III base oil, a Group IV base oil, or combinations thereof;
a boron-containing polyisobutenyl succinimide dispersant, wherein the boron-containing succinimide dispersant is derived from a polyisobutylene having a vinylidene content of greater than 70 mol % where the dispersant has a number average molecular weight of from 1750 to 2200 and wherein the boron-containing succinimide dispersant is present in the lubricating composition in an amount of 0.2 to 2.1 wt %;
a boron-free polyisobutenyl succinimide dispersant wherein the boron-free polyisobutenyl succinimide dispersant includes a combination of a first boron-free polyisobutenyl succinimide dispersant having a number average molecular weight of from 1150 to 1650 and a second boron-free polyisobutenyl succinimide dispersant having a number average molecular weight of from 1950 to 2500, wherein the first boron-free polyisobutylene succinimide dispersant is present in an amount of 60% to 90% by weight of the total combination of the first boron-free polyisobutenyl succinimide dispersant and the second boron-free polyisobutenyl succinimide dispersant and wherein the boron-free polyisobutenyl succinimide dispersant is present in the lubricating composition in an amount of 0.5 to 6.5 wt. %;
an overbased magnesium-based detergent in an amount to deliver at least 400 ppm magnesium to the lubricating composition;
an overbased calcium-based detergent in an amount to deliver at least 400 ppm calcium to the lubricating composition; and
a molybdenum-containing material.