My friend is very odd: this thread about durability comparison between automatic/manual durability meant to him that manual is always better option because you can learn to change the clutch and only reason why people sell so many automatic-transmission cars is because the automatic-transmission box needs to be soon replaced. My other friend said that changing the clutch is better done with a professional mechanic because you often need to open the half of the motor. Now I am trying to find ways to judge whether an automatic gearbox is in good condition or not.
How can I judge the condition of the automatic-transmission box? How often should an automatic-transmission box be changed? Any simple rules of thumbs like every 200k km a new gearbox?