5W-40 motor oils are universal oils that have proven themselves in gasoline and diesel engines in temperate climates. These oils are all-season for those cars that are operated in countries with moderately cold winters and hot summers. Oil 5W-40 provides excellent protection of power units of cars, commercial vans, under the hood of which are both naturally aspirated engines and turbocharged engines. The line of viscosity oils 5W-40 is represented by a wide range of modifications. Suitable for modern engines, engines of older generations and engines of rare cars. A distinctive feature of these oils is the optimal viscosity. That is, the oil leaves a fairly thick protective film on the parts and at the same time has a good fluidity. There are both synthetic and semi-synthetic oils.