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Natural synthetic esters are nowadays often applied as lubricants for their advantageous characteristics such as good biodegradability, low toxicity and the fact that they enable safe operation under very low and high temperatures. There is a wide range of applications in which the natural synthetic esters are used for their good biodegradability characteristics. Currently, a number of investigations are done towards oxidation stability of the natural synthetic esters. The methods of assessing the oxidation stability, benchmarking results and the outcome of a study on the effect of anti-oxidants in natural synthetic esters are decribed.