Universal tractor transmission oil (UTTO) is multifunctional tractor oil formulated for use in transmissions, final drives, differentials, wet brakes, and hydraulic systems of farm tractors employing a common oil reservoir. In the present work, the gear protection properties of two formulated vegetable-based UTTO oils, one synthetic ester-based UTTO oil, one synthetic ester gear oil, and one mineral-based UTTO oil are investigated. The data, presented in this paper, have demonstrated that the formulated vegetable-based UTTO oils have high lubricity, high viscosity indexes and provide equivalent or - in some aspects - superior gear protection performance compared with the mineral-based UTTO oil. The high-oleic sunflower oil formulation derived from the genetically modified plant has shown better results than the rapeseed-based (canola-based) oil formulation.
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