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Welcome to SCoA! :)

What year is your smart? As far as I know there is no requirement from the factory to replace the transaxle fluid for the 2008-2015 North American smarts.
 

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When should have the transmission fluid replaced?

Your 2008 to 2015 transmission is based on gear oil and as such does not require a fluid replacement. It won't hurt the car if you did, you may even keep the transmission a little cleaner over the years and high mileage situations if you do. But the gear oil is not stressed in any significant way to require a fluid change interval. I pushed a smart 451 over 200k without any issue with the smart's transmission.
 

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Here’s the gear oil I used. Recommend by our smart car, service manager. I changed mine around 60K miles. No harm in changing it. Not that expensive. Pretty easy to do.

 
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