Hydraulic oil products are formulated from hydrotreated mineral oil (base oil) and multiple functional additives such as demulsifiers, pour point depressants, and antifoaming agents. They belong to mineral-based lubricants and are suitable for medium- and high pressure hydraulic systems in metallurgy, construction, shipping, and mobile machinery. The dataset includes primary raw materials, auxiliary materials, and energy used in the production process; however, infrastructure such as production equipment and factory construction is excluded from the system boundary. The life cycle inventory is compiled from data sourced from multiple references. The manufacturing process of hydraulic oil consists of several steps, including raw material preparation, heating, additive blending, and packaging.