Pripol 1013 is a distilled dimer acid that can be used to improve corrosion inhibition, aid lubricity and modify rheology within drilling mud formulations, oilfield production and diesel fuel. Pripol 1013 is added to corrosion inhibitor formulations to neutralise the amine component; this subsequently creates an oil soluble corrosion inhibitor. Pripol 1013 has shown excellent performance in a typical formulation, improving the film forming properties of an oil soluble corrosion inhibitor formulation. Pripol 1013 interacts with metal surfaces therefore enhancing the film forming properties of corrosion inhibitor formulations.