CREATE TABLE table_11138 ("model" TEXT, "max. motive power" TEXT, "max. torque at rpm" TEXT, "engine displacement" TEXT, "engine type" TEXT, "engine configuration & notes 0-100km/h" TEXT)

What is the engine type with a model with base 2.4?
SELECT "engine type" FROM table_11138 WHERE "model" = 'base 2.4'
SELECT "engine type" FROM "table_11138" WHERE "model" = 'base 2.4'