Dear My C70 D5 Bj 07 “produces” increasingly engine oil, now 1 litre within about 7-8 weeks… Apparently this is a well-known problem with the D5. But where is the place, where do I have to look? Driver profile: work path 27 km, fast over road, short distances we rarely drive, on the WE we drive almost always over 1 hour in the mountains. The injectors were replaced times, according to information from there the engine would have to run uncleanly if they ran. Gspump and engine apparently still works, said the friendly one. Is there a main suspect in this well-known problem of oil reproduction in the D5 engine? Thank you already.