A slow-burning, hydraulic fluid intended for use in hydraulic moulding and transporting machines for underground mining, hydraulic pressurized casting machines and transporting machines, plastic injection moulding machines, hydraulic hammers and presses, coke oven devices and hydraulic equipment used in aviation and naval applications. It gives the system good lubrication, biological stability and anti-corrosive protection. It does not negatively affect hydraulic system seals. It contains modified plant oil, synthetic lubricants, polyethylene glycol, biocide additives, corrosion inhibitors, and water (>35%). It is readily biodegradable after diluting in groundwater.