Patent ID: 7543445

Claim:
A method for regenerating or improving the regeneration of a diesel particulate filter during the operation of a diesel engine, comprising: lubricating the engine with a lubricant composition comprising (A) a major amount of an oil of lubricating viscosity; (B) a minor amount of at least one overbased metal-containing detergent; and (C) at least one organic composition containing titanium; wherein the detergent is derived from a detergent substrate; the metal of the detergent is an alkali metal, an alkaline earth metal, or a mixture thereof; and the overbased detergent has more than 1 equivalent of metal per equivalent of the detergent substrate; and wherein the detergent substrate comprises an alkylarenesulfonic acid, a sulfur-coupled alkylphenol, an alkyl-substituted salicylic acid, a reaction product of an alkylphenol and formaldehyde, a reaction product of an alkylphenol and formaldehyde and a salicylic acid, an aliphatic monocarboxylic acid or polycarboxylic acid or reactive equivalent thereof, or a mixture thereof; wherein the regenerating or improving the regeneration of the diesel particulate filter comprises reducing the ignition temperature of soot, reducing the maximum combustion temperature of soot, or a combination thereof.