True or False: The engine is mounted longitudinally in all four-wheel drive vehicles.

The statement is false because not all four-wheel drive vehicles have their engines mounted longitudinally. While some four-wheel drive vehicles do feature a longitudinal engine layout—where the engine is oriented front-to-back—many vehicles utilize a transverse engine layout, especially in compact SUVs and crossovers.

The configuration often depends on the design of the vehicle, the intended use, and other engineering choices made by the manufacturer. For instance, front-wheel drive-based vehicles may have transverse engines to save space and improve fuel efficiency, even if they offer four-wheel drive capabilities. Therefore, it's essential to recognize that engine orientation is not a defining characteristic of four-wheel drive vehicles as a whole.