Oilcentrifuges Protecting the lubricating oil in Diesel engine technology Throughout the world, legislation regarding harmful substance emissions for passenger cars and commercial vehicles is becoming more and more stringent. For this reason, the automotive industry plans to apply sophisticated combustion technology, including exhaust gas recirculation, for example, the Diesel engines in the future. This trend in engine technology has already led to a substantial increase in the amount of soot contaminating the lubricating oil. What is more, customers in the motor industry are demanding longer oil service intervals. Some of the soot particles formed as a by-product of combustion get past the piston rings and penetrate into the crankcase, where they are absorbed into the lubricating oil. Modern lubricating oils contain additives which retain the soot particles in suspension, thus preventing sludge formation in the engine. However, as the concentration of soot increases, the oil becomes more viscous, which reduces its lubricating capacity. Furthermore, the soot particles essentially consist of carbon – they are therefore very hard and accelerate wear considerably. As a result, to minimise engine wear, the concentration of soot particles in the lubricating oil must be kept as low as possible. Full-flow filtration cannot be carried out, due on the one hand to the risk of blocking of the filter, and on the other hand due to the impractical effort of filtering out the small soot particles (< 1 µm). The solution lies in the bypass filtration process, in which a portion of the lubricating oil is filtered separately to a high standard. One of the most effective processes in bypass filtration is to clean the oil through centrifuging. Depending on your specific requirements, MANN+HUMMEL offers centrifuge concepts as a stand-alone solution or in combination with a full-flow filter. In this way, the soot content in the engine oil is reduced, and service intervals can be significantly extended.