Motor oil effects on characteristics of engine

Over the last decades there has been more and more severe requirements set to producers of motor vehicles and lubricants. Beside the fact they should provide functional, reliable and permanent operation, a vehicle as a whole is expected to give an adequate answer to wider and various market requirements in terms of environmental protection, improvement of vehicle performance, reduction of fuel consumption and increased traffic safety. When it comes to requirements related to lubricant characteristics, ways of use and intervals in which their replacement should take place, they are becoming more severe, since the motor vehicles' constructors keep making new and harder conditions in reference with performance improvement and lubricant efficiency. This paper describes the results of motor oil quality measurements in relation with exterior speed characteristics of engine as well as the testing programme for oil in the engine on motor brake. The evaluation of motor oil quality is monitored by measuring sediments in vital parts of engine on one hand, and on the other, by measuring output characteristics of engine