TECHNOLOGY FOCUS - POLYMERS - Preferred Composition: The additive for improving the filterability comprises at least one polymer comprising ester groups having a number average molecular weight Mn of from 750 to 100000 g/mol and a polydispersity Mw/Mn of from 1 to 8. Polymer comprising ester groups comprises a weight average molecular weight Mw in the range of 1000 to 60000 g/mol. Polymer comprising ester groups is a polyalkyl (meth) acrylate polymer having a number average molecular weight Mn of from 750 to 100000 g/mol and a polydispersity Mw/Mn of from 1 to 8. Polymer comprising ester groups is a polyalkyl (meth) acrylate polymer comprises a weight average molecular weight Mw in the range of 1000 to 60000 g/mol. The polyalkyl (meth) acrylate polymer comprises at least 40 % by weight of repeating units being derived from alkyl (meth) acrylates having 7 to 40 carbon atoms in the alkyl residue. Polydispersity Mw/Mn of the polyalkyl (meth) acrylate polymer is in the range of from 1.2 to 5. The polyalkyl (meth) acrylate polymer comprises 5 to 80% by weight of repeating units being derived from alkyl (meth) acrylates having 16 to 40 carbon atoms in the alkyl residue. The polyalkyl (meth) acrylate polymer comprises a weight ratio of repeating units being derived from alkyl (meth) acrylates having 16 to 40 carbon atoms in the alkyl residue to repeating units being derived from alkyl (meth) acrylates having 7 to 15 carbon atoms in the alkyl residue being in the range from 3:1 to 1:1. The weight ratio of the polyalkyl (meth) acrylate polymers comprising repeating units being derived from alkyl (meth) acrylates having 16 to 40 carbon atoms in the alkyl residue to the other polyalkyl (meth) acrylate polymer is in the range from 10:1 to 1:10. The composition comprises at least 70% by weight fuel oil. Biodiesel comprises fatty acid esters which are derived from monohydric alcohols having 1 to 4 carbon atoms. Biodiesel comprises at least 10% by weight of fatty acid esters which are derived from methanol and/or ethanol and saturated fatty acids. Biodiesel comprises at least 5 ppm steryl glycosides. Preferred Components: The additive for improving the filterability comprises at least two polyalkyl (meth) acrylate polymers. One of the polyalkyl (meth) acrylate polymers comprises repeating units being derived from alkyl (meth) acrylates having 16 to 40 carbon atoms in the alkyl residue. One of the polyalkyl (meth) acrylate polymers comprises repeating units which are derived from hydroxyl-containing monomers and/or (meth) acrylates of ether alcohols. Polyalkyl (meth) acrylate polymers comprises repeating units which are derived from hydroxyl-containing monomers and/or (meth) acrylates of ether alcohols have a lower molecular weight than the other polyalkyl (meth) acrylate polymer. The fuel oil comprises a mineral oil. Preferred Parameters: The biodiesel comprises a Ranzimat value of at least 6 hours. The biodiesel comprises a CSFT value of 300 ml after 500 seconds without any additive for improving the filterability. Biodiesel comprises 0.15 to 1.0 % by weight additive for improving the filterability. EXAMPLE - No suitable example given.