Moin, Bin new here to ask this question. Goes around my recently purchased F06 640d. Bj 07 2012, 208tkm run, engine was overhauled by the previous dealer (about 50tkm). Machine does not swallow a drop of oil and generally it drives great. However, the engine shakes heavily in the cold start. After cold start the engine purrs as if there had never been any problems. Jumps warm also again and again without jerking. Test drive was inconspicuous, except for light exhaust smell, which I m I don’t think a leaky cracker would affect the cold start? Then maybe the injector rather? Previous owner said that cold start would have become more intense over the kilometers. Error memory is empty. Agr was not changed long ago to Kulanz. Coated suction crack would make itself known in the error memory or? Someone might have had a similar problem? Am about every help Thank you.