One of the most common types of transmission services is a fluid change. During this process, a significant amount of transmission fluid is drained, and the transmission filter is replaced, removing a substantial portion of buildup. While not a complete swap, a fluid change contributes to better transmission performance. Unlike fluid changes, flushes are typically done at milestones like 50,000 and 100,000 miles. Most mechanics recommend fluid changes every 30,000 to 60,000 miles, ensuring your transmission stays in top condition.