Experimental Investigation of Lubricating Properties of Engine Oil

The lubricant oil reflects the performance of engine through its properties, while condition of lubricant o il can affect the performance of engine as well. Th is interrelationship between engine performance and engine lubricant is an important diagnos tic tool to evaluate the engine health and performance. In the present work, various different running distances used engine oil samples were diagnosed for found a relation between running distances and level of depletion of o il properties and also the condition of engine. The various lubricating o il test methods were used for determine the level o f deplet ion of physical p roperties of the used engine oil. Comparative study between level of fresh oil and used oil properties also has been done. The total ba se and acid number, viscosity, water content in o il, total insoluble present in oil, extreme pressure and anti wear properties tests were done on oil samples. The results shows that used oil samples has been contaminated water and acid and level of contaminat ion also increases with increased running distances and due to this corrosion increased and anti wear properties decreased. Viscosity was decreased at low running distance but it increased at more running distance.