Hydraulic oil is the working medium for transmitting and converting energy in hydraulic systems, while also providing lubrication, cooling, rust prevention, and shock absorption. This hydraulic oil dataset represents a weighted average of the production processes for 'Hydraulic oil, semi-synthetic type, polyolefin', 'Hydraulic oil, fully synthetic type, polyether', 'Hydraulic oil, fully synthetic type, polyol ester', and 'Hydraulic oil, mineral type'. If the specific type of hydraulic oil is not clearly defined, this dataset can be used. Detailed technical specifications, system boundaries, and other information are described in the production datasets for each specific type of hydraulic oil. Infrastructure such as production equipment manufacturing and facility construction are not included within the dataset boundary.