A cooling arrangement for a vehicle engine including at least one cooling element which has flowing through it a gaseous medium operable to being cooled by an external air flow which flows in a specified direction through the cooling element during operation of the combustion engine. The apparatus further comprises a compartment which is so configured as to receive a slow-releasing grease treating formulation. The method also includes converting the input flow stream into a simulated output flow stream, which includes an output component basis that differs from the input component basis and comprises a single, active group of oil components and zero or more pure components.