A semi-synthetic engine oil with a near-universal applicability in petrol and diesel engines in passenger cars and light duty commercial vehicles. This oil provides a good lubricating film at the cold start and offers an excellent lubricating film at high operating temperatures as well. Because of the unique formulation, the oil has a low evaporation tendency while fuel saving as well as exhaust emission reduction can be obtained. The oil is temperature-stable and will maintain its quality level.