The use of at one or more additives to reduce the filter blocking tendency of a fuel composition having a tendency to block filters, wherein the fuel composition comprises a renewable diesel component and a biodiesel component; and wherein the one or more additives are selected from (a) a copolymer comprising units of formula (I):

##STR00001## and units of formula (II):

##STR00002##

wherein R is an alkyl group and each of R.sup.1 and R.sup.2 is an alkyl or alkenyl group having 6 to 22 carbon atoms; (b) the reaction product of a polycarboxylic acid having at least one tertiary amino group and a primary or secondary amine; and (c) the reaction product of secondary amines and a copolymer of maleic anhydride and an -olefin.

A fuel composition including renewable diesel and one or more low temperature enhancing additives selected from (a) a copolymer comprising units of formula (I):

##STR00001##

and units of formula (II):

##STR00002##

In which the R is an alkyl group and each of R.sup.1 and R.sup.2 is an alkyl or alkenyl group having 6 to 22 carbon atoms; (b) the reaction product of a polycarboxylic acid having at least one tertiary amino group and a primary or secondary amine; and (c) the reaction product of secondary amines and a copolymer of maleic anhydride and an -olefin.

This invention provides a wax inhibitor composition comprising A) the reaction product obtainable by reaction of i) a carboxylic acid containing an optionally substituted cycloaliphatic hydrocarbyl residue with ii) an alkylene polyamine, B) a polymeric wax inhibitor, and C) an organic solvent.

The present invention relates to novel uses of copolymers for removing and/or reducing the level of deposits in the fuel system and/or injection system of direct injection diesel and/or gasoline engines.

The present invention relates to novel uses of corrosion inhibitors in fuels and lubricants.

The present invention relates to a fuel oil having a sulfur content of less than 50 ppm, comprising i. at least one oil-soluble amide-ammonium salt of a polycarboxylic acid with a mono- and/or dialkylamine (A) and ii. 5-100% by weight, based on the amount of amide-ammonium salt (A), of an oil-soluble amine (B), and iii. a lubricity additive (C) selected from fatty acids, fatty acid partial esters of polyols and fatty acid amides of alkanolamides, and wherein the fuel oil consists of fuel oil of mineral origin, synthetic fuel or a mixture thereof.

Concentrates containing specific functionalised diblock copolymers serve as effective additives for improving the cold flow behaviour of fuels and oils, the copolymers being derived from a terminally-unsaturated intermediate polymer obtained via a metallocene process involving hydrogen.

The present invention relates to novel uses of corrosion inhibitors in fuels and lubricants.

An additive composition for a marine fuel or a heating oil comprising a stabilized colloidal dispersion of catalytic metal particles, a neutral or overbased alkaline earth metal detergent and a carrier fluid miscible with a marine fuel oil, a heavy fuel oil, a marine distillate fuel, and/or a residual fuel oil. Also provided are marine fuel and/or heating oil compositions having the additive composition described above and associated methods and uses.

An improvement of the flow properties of paraffin-containing crude oil, more specifically, a means of favourably influencing the pour point of crude oil and hence improving the flow properties of paraffin-containing crude oil. The crude oil composition is a paraffin-containing crude oil and has an amount of an additive that brings about lowering of the pour point of the crude oil, wherein the additive comprises at least one copolymer composed of at least two comonomers, and wherein all comonomers that make up the copolymer are selected from the groups (a) and (b) of comonomers, and wherein group (a) is comonomers formed from acrylic acid and methacrylic acid, and group (b) is comonomers formed from styrene and a styrene derivative.