When should transmission fluid generally be changed?

Changing transmission fluid every 30,000 to 60,000 miles is generally recommended to maintain the optimal performance and longevity of the transmission system. Over time, transmission fluid can become contaminated with debris, metal shavings, and other particulates that arise from normal wear and tear. This contamination can hinder the fluid’s ability to lubricate and cool the transmission components effectively, leading to increased wear and potential transmission failure.

Regularly replacing the transmission fluid within this mileage range helps ensure that the fluid retains its properties, promoting smoother shifting and preventing overheating. It also allows for the removal of any accumulated impurities, thus protecting the internal components of the transmission. While some newer vehicles may have extended intervals due to advanced fluid technology, the 30,000 to 60,000-mile mark remains a practical guideline for many vehicles.

In contrast, intervals such as every 10,000 to 20,000 miles may be excessive for most vehicles and can lead to unnecessary costs. Waiting until 100,000 miles or more may risk severe damage or reduced performance, as fluid degradation can significantly compromise transmission function. Relying on a fluid change strictly based on obvious signs of a leak disregards the importance of proactive maintenance that contributes to the overall health of the transmission