hi all. i knw is abit weird that to ask in this way! how to knw it is M52b28/TU without check through register card n chasis num? becos my fren gonna buy an E39 1998 n the owner claim that he oredy transpalant the engine to M52b28/TU but without re-register. any "special" things to check the engine to confirm that is M52b28/TU? me did check through one of our forumer did ask about the different Single Vanos n Double Vanos(frm the pic contribute by our forunmer). can we judge by the Vanos? thanks and regaards