On maximum allowable crankcase gas emissions defining the ultimate life of internal combustion engines

Introduction (problem statement and relevance). The presented materials reasonably prove the need to define the maximum allowable value (volume) of crankcase gas (CG) emissions by motor vehicle internal combustion engines (ICE’s), which determines objectively their ultimate life and functionality condition. The purpose of the study is to investigate and identify the main cause of the ICE oil aging process with increasing CG emissions. Scientific novelty and results. The studies have identified the minimum volumes of CG emissions during normal operation and ultimate emissions unacceptable for further operation of an ICE. The practical significance consists in changing the CG separator operation not to forward the condensed oil vapor with particulate matters to the oil in the crankcase, but to dispose thereof, which will allow increasing the oil change intervals when in maintenance.