the automatic transmission should have a -regular- fluid change schedule. If you follow it you should not need to flush. If you have ignored it and the fluid's went bad then I would flush (do not use ...
Transmission flushes are generally unnecessary for preventive maintenance and should only be done as a last resort. White smoke from the exhaust indicates an internal coolant leak, which can be costly ...
You take your car in for a quick oil change, and the mechanic recommends another service. Those add-ons aren’t just expensive ...