My Master II 2.5 dci 120 (about 90′ km) had already a crack when buying it. Especially this was noticeable in the 2nd gear during acceleration. It appears differently strongly. Recently however more often. In addition, a slightly rough engine run at full throttle. The consumption felt a bit increased. However, since I drive irregularly and no similar distances, it does not have to be It is also not significant, consumption is less than 9 liters. My explanation would be that a cylinder gets too little diesel. How can you best limit that? Can it be that the high pressure pump possibly supplies a cylinder irregularly? In idle mode and without load the engine rotates quietly. Only with more or less full gas the problem shows up. And not always and not equally strong. Does someone know the technology well? Does someone know a specialist in the Großra around east of Stuttgart greetings from Swabia Thorsten