A polymeric composition suitable for lowering the Pour Point of paraffinic crude oils comprising a synergic mixture including at least two ethylene-vinyl acetate copolymers respectively having an average molecular weight Mw lower than 130,000 Dalton (measured via GPC), a content of vinyl acetate monomer ranging from 15 to 50% by weight, with the proviso that the content of vinyl acetate monomer in the respective copolymers differs from one copolymer to another, by over 5%, on a weight basis.

The present disclosure provides fuel additives including Mannich detergent additive(s) and Mannich-based quaternary ammonium salt detergent additive(s) effective to improve engine performance in both port fuel injected and gasoline direct injection engines.

Provided is a fuel-reducing composition for diesel internal combustion engines, which includes nanosized crushed nanomaterials and uses a lubricity improver to ensure sufficient dispersion. This allows for the cleaning of the combustion chamber and promotes complete combustion, which enhances output while reducing fuel consumption. By using the fuel-reducing composition for diesel internal combustion engines formed according to the preferred embodiment of the present invention, the size of the nanomaterials is limited, allowing for efficient cleaning of the combustion chamber without interfering with combustion. Without the use of surfactants for the dispersion of nanomaterials, a lubricity improver is employed to facilitate smooth dispersion while simultaneously protecting the combustion chamber of the engine and promoting complete combustion. Since the nanomaterials do not adhere to each other due to their size limitation and the use of the lubricity improver, combustion proceeds smoothly, leading to complete combustion and producing the desired effects.

A diesel fuel additive includes a cetane number improver and an at least one organometallic combustion catalyst in solution and/or at least one metal-oxide combustion catalyst in suspension.