ALPINA just registered the trademark for an "SD4" - which leads to speculation about the imminent release of facelifted Diesel-Engine and a 4-Series based Diesel :biggrinbounce:
https://register.dpma.de/DPMAregister/marke/register/3020140428784/DE
https://register.dpma.de/DPMAregister/marke/register/3020140428784/DE