Final answer:
Technician A is correct; newer vehicles require less maintenance due to advancements in technology, contrary to Technician B's claim that newer engines need major repairs more frequently.
Step-by-step explanation:
Between Technician A and Technician B, Technician A is correct. With advances in technology and engineering, newer vehicles are designed to be more reliable and require less maintenance than older vehicles. Modern cars have longer service intervals and components that are built to last longer. On the other hand, Technician B's claim that major repairs are needed more frequently on newer engines is generally incorrect, as newer engines are typically more advanced in terms of efficiency, durability, and reliability. While modern vehicles may require specialized tools and knowledge for repairs, the frequency of major engine repairs is not necessarily higher than that of older cars.