Gear oil is composed of Group I mineral base oils and additives, belonging to mineral-based lubricants, suitable for lubrication and protection of heavy-duty industrial gears. The dataset includes major raw materials, auxiliary materials, and energy used in the production process; however, infrastructure such as production equipment and facility construction is not included within the system boundary. The life cycle inventory is compiled from data sourced from multiple references. The manufacturing process of gear oil includes oil formulation, continuous blending, refining, additive incorporation, filtration, and packaging.