Mensah-Brown, Henry2023-07-262023-07-262015-02-02Mensah-Brown, H. (2015). Re-refining and recycling of used lubricating oil: An option for foreign exchange and natural resource conservation in Ghana. ARPN Journal of Engineering and Applied Sciences, 10(2), 797-801.1819-6608https://ir.mug.edu.gh/handle/123456789/159The paper reviews the re-refining of used automotive engine lubricating oils to obtain lube stock with the right characteristics and additives’ response suitable for blending automotive engine lubricating oil. The caustic treatment and subsequent vacuum distillation method for re-refining of used automotive gasoline engine lubricating oils was used in this investigation. A lube stock with the appropriate properties and characteristics including additive response for the formulation of SAE 40 grade lubricating oil suitable for an automotive gasoline engine was obtained from a blend of rerefined used lubricating oil and virgin bright lube stock in the ratio 3:1. The lube stock had a viscosity index (VI) of 105.enlubricating oilViscosity indexNeutralization numberVacuum distillationOxidation stability testArticle