At least one nitrogen-containing detergent to reduce the filter blocking tendency of a fuel composition having a tendency to block filters. The fuel composition includes a renewable diesel component and a biodiesel component.

A fuel composition which includes at least: a fuel from one or more sources selected from the group that comprises mineral, plant and synthetic sources; a compound (T1) selected among polyalkylene glycols, C1-C12 alkyl and polyalkylene glycol ethers, and the mixtures thereof; and a compound (T2) selected among the non-ionic emulsifiers. Also, an additive composition including at least: a compound (T1) selected among the C1-C6 alkyl and polyethylene glycol ethers including two to six units of ethylene glycol; a compound (T2) selected among the esters of one or more C1-C36 alkenyl carboxylic or alkyl carboxylic acids, and a polyol selected among sorbitan and isosorbide, taken alone or mixed together; and possibly a detergent additive. Further, a method for preventing, avoiding or delaying the formation of ice crystals or flakes in a tank of a vehicle provided with an internal combustion engine.

A fuel composition which includes at least: a fuel from one or more sources selected from the group that comprises mineral, plant and synthetic sources; a compound (T1) selected among polyalkylene glycols, C1-C12 alkyl and polyalkylene glycol ethers, and the mixtures thereof; and a compound (T2) selected among the non-ionic emulsifiers. Also, an additive composition including at least: a compound (T1) selected among the C1-C6 alkyl and polyethylene glycol ethers including two to six units of ethylene glycol; a compound (T2) selected among the esters of one or more C1-C36 alkenyl carboxylic or alkyl carboxylic acids, and a polyol selected among sorbitan and isosorbide, taken alone or mixed together; and possibly a detergent additive. Further, a method for preventing, avoiding or delaying the formation of ice crystals or flakes in a tank of a vehicle provided with an internal combustion engine.

A detergent additive package, fuel additive concentrate, fuel composition and method for operating an engine on an unleaded gasoline fuel. The additive package includes a Mannich base detergent mixture, wherein the mixture contains a first Mannich base detergent component derived from a di- or polyamine and a second Mannich base detergent component derived from a monoamine. A weight ratio of the first Mannich base detergent to the second Mannich base detergent in the mixture ranges from about 1:6 to about 3:1.

A detergent additive package, fuel additive concentrate, fuel composition and method for operating an engine on an unleaded gasoline fuel. The additive package includes a Mannich base detergent mixture, wherein the mixture contains a first Mannich base detergent component derived from a di- or polyamine and a second Mannich base detergent component derived from a monoamine. A weight ratio of the first Mannich base detergent to the second Mannich base detergent in the mixture ranges from about 1:6 to about 3:1.

The invention relates to the use of specific quaternised nitrogen compounds which are also subjected to specific transesterification or amidation, as a fuel and lubricant additive or kerosene additive, such as in particular as a detergent additive, for decreasing or preventing deposits in the injection systems of direct-injection diesel engines, in particular in common rail injection systems, for decreasing the fuel consumption of direct-injection diesel engines, in particular of diesel engines having common rail injection systems, and for minimizing the power loss in direct-injection diesel engines, in particular in diesel engines having common rail injection systems. The invention further relates to the use as an additive for petrol, in particular for operation of DISI engines.

The invention relates to the use of specific quaternised nitrogen compounds which are also subjected to specific transesterification or amidation, as a fuel and lubricant additive or kerosene additive, such as in particular as a detergent additive, for decreasing or preventing deposits in the injection systems of direct-injection diesel engines, in particular in common rail injection systems, for decreasing the fuel consumption of direct-injection diesel engines, in particular of diesel engines having common rail injection systems, and for minimizing the power loss in direct-injection diesel engines, in particular in diesel engines having common rail injection systems. The invention further relates to the use as an additive for petrol, in particular for operation of DISI engines.

A quaternary ammonium compound of formula (X):

##STR00001## wherein R.sup.0, R.sup.1, R.sup.2 and R.sup.3 is each individually an optionally substituted alkyl, alkenyl or aryl group and R includes an optionally substituted hydrocarbyl moiety having at least 5 carbon atoms.

Fuel additive compositions having at least one acylated detergent, at least one Mannich detergent, and at least one polyether and/or polyetheramine. The acylated detergent may be the reaction product of a hydrocarbyl-substituted acylating agent and a nitrogen containing compound having at least one amino group, that may optionally be quaternizable, and at least one oxygen or nitrogen atom capable of reacting with the hydrocarbyl-substituted acylating agent. The compositions are useful for reducing the formation of carbonaceous deposits and/or cleaning carbonaceous deposits in an engine, such as a gasoline direct injection engine.

Fuel additive compositions having at least one acylated detergent, at least one Mannich detergent, and at least one polyether and/or polyetheramine. The acylated detergent may be the reaction product of a hydrocarbyl-substituted acylating agent and a nitrogen containing compound having at least one amino group, that may optionally be quaternizable, and at least one oxygen or nitrogen atom capable of reacting with the hydrocarbyl-substituted acylating agent. The compositions are useful for reducing the formation of carbonaceous deposits and/or cleaning carbonaceous deposits in an engine, such as a gasoline direct injection engine.