Moin dear municipality, at the time of my last diesel (330D, driven until 2009) it was usual to give 250ml of “meat-in” two-stroke oil to each tank filling. The advantage was a lubrication of injectors and other fuel-side components. In addition, the engine should remain cleaner. The oil mixed with the diesel and no longer demixed, so it has always been used evenly with the diesel. The running culture was noticeably better, the mot or sounded healthier… Actually, I would like to handle this again with my current one, but I am uncertain about the slightly higher combustion temperatures and the use of AdBlue today. The current car has the Euronorm 6 in conjunction with an AdBlue tank, which is freely accessible. Is there someone here deeper in the matter and can tell me if there is still an advantage to hope for here, or do I rather destroy everything in connection with the new exhaust technology? Thanks from the Spiesel