What statement is correct regarding the change of automatic transmission fluid?

The correct statement acknowledges that both Service Consultant A and Service Consultant B provide incomplete or misleading advice regarding the change of automatic transmission fluid.

Automatic transmission fluid (ATF) typically does not need to be changed on a yearly basis, as suggested by Service Consultant A. The frequency of fluid changes can vary significantly based on the vehicle manufacturer's recommendations, the type of driving conditions experienced, and the specific transmission design. Many manufacturers have extended service intervals for ATF changes, indicating that the fluid can last several years or tens of thousands of miles under normal driving conditions.

On the other hand, Service Consultant B's claim that the fluid lasts for the vehicle's lifetime is also problematic. While some newer vehicles are equipped with "lifetime" fluids designed to last for the expected lifespan of the car, many manufacturers still recommend periodic fluid changes to maintain optimal transmission performance and longevity. Transmissions can experience wear and degradation over time, making it crucial to service the fluid as part of regular maintenance.

Therefore, the realistic approach involves understanding the manufacturer's specific recommendations regarding transmission fluid service intervals, which are often found in the vehicle owner’s manual. This balance of service and longevity is why neither statement from the consultants is entirely accurate or acceptable in a standardized automotive maintenance context.