The Lubrizol Corporation

Saleem Al-Ahmad

Paul E Adams

Patrick E Mosier

John Kent Pudelski

Jonathan S Vilardo

Ewa A Bardasz

Marina Baum

Jack C Kelley

Melody Wilk

The disclosed invention relates to polymers with heterocyclic-containing groups, and to concentrates and lubricating oil compositions containing the polymers.

Polymers with pendant heterocyclic-containing groups and lubricating oil compositions containing same

An internal combustion engine with a catalyst-containing exhaust-gas aftertreatment device is lubricated with a composition of a base oil; and a zinc salt of a mixture of phosphorus-containing compounds having hydrocarbyl groups Rand Rwhere the average total number of carbon atoms in Rplus Rfor the mixture of phosphorus-containing compounds is at least 9.5, where 4 to 30 weight percent of such groups contain 2 to 4 carbon atoms and where in less than 8 mole percent of the phosphorus-containing molecules in the mixture of phosphorus-containing compounds each of Rand Rcontain 2 to 4 carbon atoms.

Method of lubricating an internal combustion engine and improving the efficiency of the emissions control system of the engine

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Jeddah, Saudi Arabia

Saleem Al-Ahmad