Many manufacturers recommend a transmission flush every 30,000 miles or 2 years. ... A transmission flush can extend the life of your transmission. Like all preventative maintenance, the cost and time of this process can save you from expensive transmission repairs down the road.

Why You Should Never flush your transmission fluid?

Transmission fluid is highly detergent which can wash the varnish off clutches, causing it to slip. Pressure flushing can cause aging seals to start leaking. When it leaks more than a quart it could burn up the unit.

Is a transmission flush a bad idea?

A transmission flush is a perfectly safe service for your car, and is worth the extra money it costs. Transmission flushes have a bad rap however as some people expect a flush to fix major problems, such as slipping and stalling.