Question: What years did the sDrive16d model have a Torque of N·m (lb·ft)@1750-3000?
SQL: SELECT "Years" FROM "2-18964684-2" WHERE "Torque" = 'N·m (lb·ft)@1750-3000' AND "Model" = 'sDrive16d';

Question: What is the torque of the xDrive20d model, which has a power of PS (kW; hp)@4000?
SQL: SELECT "Torque" FROM "2-18964684-2" WHERE "Power" = 'PS (kW; hp)@4000' AND "Model" = 'xDrive20d';

Question: What is the engine code of the xDrive23d model?
SQL: SELECT "Engine code" FROM "2-18964684-2" WHERE "Model" = 'xDrive23d';

Question: What model is the N·m (lb·ft)@1500-2500 torque?
SQL: SELECT "Model" FROM "2-18964684-2" WHERE "Torque" = 'N·m (lb·ft)@1500-2500';