The paper presents studies of the main physical and chemical indicators of the operation of synthetic oils. The following indicators were determined: kinematic viscosity at 100°C, viscosity index (IV); general base indicator, mg KOH/1g of oil, ignition temperature in an open crucible, °C, absolute density, g/cm3 (at t° at 20°C), dynamic viscosity and sulfonated ash content (%). In addition, comparative studies of the technical and economic indicators of regulatory and technical maintenance when changing engine oil were carried out.