I always change trans fluids once a year, some people say its overkill but I've never had a transmission failure so I don't feel it is.
Regular dino oil I wont let pass 3000 miles.
I wont lie, I never change my coolant unless it starts to look weird or I do a water pump or thermostat. Brake fluid also has a change interval but I don't do it, where I live the lines rot from the salted roads way before any contaminants in the oil will kill the lines, the lines on my cobalt look brand new and its a 2005
2009 Ford Escape Limited - 3.0L, 6 speed auto, 4x4, 25/33 city/hwy imp mpg.
2017 F150 XLT-XTR - 5.0L, 4x4, 3.55's, E-locker, xtr chrome package, fx4 off-road package.
20/25 imp mpg