Hello together my smart burns oil that has confirmed to me also the smart center. These have also unscrewed the spark plugs,these are fine. Have the engine in interior room with a camera looked at and found nothing. Presumably a hair crack in the engine room. But know nothing exact. Have no power loss and temperature rises no higher than 60 degrees. Qualt blue and jerks in the stand. Fortwo BJ2005 140TKM. Who can give me information what it can be. Crack in the engine I don’t believe greeting