Hello Forumgemeinde. I have a Mazda 6 2.0 diesel bj. 2003. I have the following problem, it consumes quite a lot of oil at the moment and it also exhales very strongly. Tags over it looks as if it is only soot, but in the dark when a car drives behind me and I see the smoke in the spotlight is somehow bluish. Now my question what could it be. My suspicion is head seal, but am not sure if I am right there. Thanks already for your help.