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Vegetable oils are extracted from agro seeds that are accumulated as fatty acid within the seeds. These are also called as natural esters. They are available from renewable sources and are treated as eco‐friendly and biodegradable liquids [29]. Vegetable oils have higher viscosity and high pour point, which degrades the effectiveness to serve as a coolant [31]. At present, the research in the field of natural esters is on to emphasize reduction of viscosity and pour points with improved oxidation stability.