CREATE TABLE table_56298 ("Model" TEXT, "Years" TEXT, "Engine code" TEXT, "Power" TEXT, "Torque" TEXT)

During which years was the Model 318td (diesel) with the Engine code of m47d20 manufactured?
SELECT "Years" FROM table_56298 WHERE "Engine code" = 'm47d20' AND "Model" = '318td (diesel)'
SELECT "Years" FROM "table_56298" WHERE "Engine code" = 'm47d20' AND "Model" = '318td (diesel)'