[Rafa]

Just got a 2008 prius with 144403 miles transmission fluid never been changed, is it advisable to change it? cause I fear that it will stop working.

 

[Easy Rider]

Yes.
And other things too.......like brake fluid service........and 12 V battery if over 5 years old.......and tires if over 7 years old no matter how good they look........and coolant......and probably other things too.