(57) A diesel fuel composition comprising a major amount of a diesel fuel, a minor amount
of at least one metallic species and a minor amount of a detergent additive; wherein
the detergent additive comprises at least one compound of formula (I) and/or formula
(II):

wherein each Ar independently represents an aromatic moiety having 0 to 3 substituents
selected from the group consisting of alkyl, alkoxy, alkoxyalkyl, aryloxy, aryloxyalkyl,
hydroxy, hydroxyalkyl, halo and combinations thereof;
each L is independently a linking moiety comprising a carbon-carbon single bond or
a linking group;
each Y is independently -OR1" or a moiety of the formula H(O(CR12)n)yX-, wherein X is selected from the group consisting of (CR1'2)z, O and S; R1 and R1' are each independently selected from H, C1 to C6 alkyl and aryl; R1" is selected from C1 to C100 alkyl and aryl; z is 1 to 10; n is 0 to 10 when X is (CR1'2)z, and 2 to 10 when X is O or S; and y is 1 to 30;
each a is independently 0 to 3, with the proviso that at least one Ar moiety bears
at least one group Y; and m is 1 to 100;

wherein: each Ar' independently represents an aromatic moicty having 0 to 3 substituents
selected from the group consisting of alkyl, alkoxy, alkoxyalkyl, hydroxy, hydroxyalkyl,
acyloxy, acyloxyalkyl, acyloxyalkoxy, aryloxy, aryloxyalkyl, aryloxyalkoxy, halo and
combinations thereof;
each L' is independently a linking moiety comprising a carbon-carbon single bond or
a linking group;
each Y' is independently a moiety of the formula ZO- or Z(O(CR22)n')y'X'-, wherein X' is selected from the group consisting of (CR2'2)z, O and S; R2 and R2' are each independently selected from H, C1 to C6 alkyl and aryl; z' is 1 to 10; n' is 0 to 10 when X' is (CR2'2)z', and 2 to 10 when X' is O or S; y' is 1 to 30; Z is H, an acyl group, a polyacyl
group, a lactone ester group, an acid ester group, an alkyl group or an aryl group;
each a' is independently 0 to 3, with the proviso that at least one Ar' moiety bears
at least one group Y' in which Z is not H; and
m' is 1 to 100.
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