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Modern internal combustion engines are the results of several years of designing to meet the growing demand of high specific power, low fuel consumption and low exhaust emissions. Nowadays, the running conditions are becoming more and more demanding and therefore modern engines must provide high performances in a variety of operating conditions like cold start, frequent start and stop, long time high speed and load. Consequently, all the components and auxiliary systems work under onerous conditions. In particular, the lubrication system is highly stressed because these circuits must supply also other components, for example the variable valve timing (VVT) actuation system. To satisfy these demanding situations, a lot of advances in lubrication technology have been achieved and more work is still needed.