A genuinely universal engine-transmission all-season semi-synthetic (HC-synthese) engine oil for modern diesel-powered engines of agricultural equipment with and without a turbocharger operating under harsh conditions as well as for manual transmissions, “wet”-type brake systems and even hydraulic systems of tractors. It was developed specially for solving particular agricultural equipment issues, ensuring the protection of the technical equipment and receiving the maximum return regardless of its operating conditions. It belongs to the STOU (Super Tractor Oil Universal) class.