Mechanical engineering has always been the core technical discipline in automotive R&D.
Vehicles have structure, wheels and engines, with many moving parts. And the R&D laboratories that develop cars and their components, with their secret access entrances and non-disclosure agreements, have traditionally been a boys' club.
To build the foundational experience toward becoming an engineering lead, you must serve time as a junior durability engineer and require time in some very hot or cold parts of the world doing real-world testing.