Table: bmw_x1_specs
Columns: model
years
engine_code
power
torque

Question: What years did the sdrive16d model have a Torque of n·m (lb·ft)@1750-3000?
SQL: SELECT "years" FROM bmw_x1_specs 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 bmw_x1_specs WHERE "power" = 'ps (kw; hp)@4000' AND "model" = 'xdrive20d'

Question: What is the engine code of the xdrive23d model?
SQL: SELECT "engine_code" FROM bmw_x1_specs WHERE "model" = 'xdrive23d'

Question: What model is the n·m (lb·ft)@1500-2500 torque?
SQL: SELECT "model" FROM bmw_x1_specs WHERE "torque" = 'n·m (lb·ft)@1500-2500'