My 2002 Grand Am has 40,000 miles on it & it's in pretty good shape. The car has a sealed transmission in it. According to the owners manual, it has lifetime fluid with no need to change it or worry about the filter. Anybody have thoughts or suggestions on this ? I'm an old timer and feel after 18 years or so it might be time to change the trans fluid. How long is the original fluid good for ? Is ok to just go to an oil change place and get the fluid changed ? Lots of stuff on google about it but, what's the real truth ? I don't want to change it and create any problems here. Comments welcome.