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Environmental awareness and environmental legislation have resulted in a new evaluation for base oils for technical applications. Biodegradable fluids like synthetic esters or plant oils have been developed which show considerable promise as a hydraulic pressure media. These fluids offer a good lubricity, good corrosion protection and compatibility with other materials. In response to the growing interest in environmentally acceptable fluids, performance data, laboratory evaluation and test experience for a vegetable based hydraulic fluid will be presented, identifying performance strengths and weaknesses in comparison to petroleum based fluids.