This multi-purpose additive contains a combination of combustion and flow improvers with an antibacterial effect. The product provides advanced cleaning properties, increase in the cetane number, reduced fuel consumption and lubrication of all moving parts of the Diesel combustion system while significantly reducing excess carbon build-up “keep-clean-effect”. A constant and powerful combustion is thus guaranteed. Especially recommended for lower quality fuels. Keeps diesel flow-able up to -30°C (depending on diesel quality). Cold start performance is improved significantly all-year-round and operational reliability is ensured during winter. Biocide properties enable the safe elimination of bacteria, fungi and algae in the fuel tank and prevents regeneration. Thus any blockage of the fuel filter is prevented.