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A tachograph which belongs to the group of ORD devices is the oldest recorder (On Board Recording Devices), and the duty of taking it was led into the USA already in 1939. In order to solve all these problems, they led with Directive of Advice No. 2135/98 from 24 September 1998 of the August of 2004 from the beginning of in the area of the European Union, new type of registering setting up in the road transport - digital tachograph. In order to make it impossible to abuse, a complex system of keys was applied cryptological and of certificates, saved in grating and devices, letting for explicit determining entitlements of users and authenticities of data, cards and devices. In spite of using the most modern keys and securing systems, with respect to elements of the system of digital tachographs a lot of modus operandis were observed so that they registered wrong sizes.

The paper presents main legal rules introducing the digital tachograh system main requirments which must be fulfilled by producers of digital tachographs in order to get the type approval, possibility of future requirements of digital tachograph, main functions of digital tachograph, characteristics of participant of digital tachograpfs system and their tools of the identification, acting and setting of authorize workshops in Poland and Europe Union, accessible methods of check and calibration of digital tachographs and their description, based on Commission Regulation (EC) No 1360/2002 of 13 June 2002, replacing the Annex 1B and Polish law. These paper also presents current level of implementation of digital tachograph system in Europe in light of introduction of digital tachograph second generation.

One of the most important utilization features of vehicle engine is its durability. Durability depends mainly on the wearing processes of frictional connections of engine elements. The studies of engine parts wearing can be divided into two kinds: quantitative and comparative according as the purpose is to define quantitative durability or comparison of the influence of selected design, technological and utilization factors. The present report describes distribution of metallic impurities coming from mechanical wear of parts in the combustion engine. Distribution of impurities between lubricating system and exhaust system is of nonlinear character. High nonlinearity appears in not fixed conditions of the engine. In the longer time interval of engine operation, the distribution proportions between oil, oil filter and exhaust gases are going to stabilize.