Changing Transmission Fluid ???

[StevenF]

I have had my car since 2015 and have done a lot of work on the car (engine, paint, interior , etc) but have not touched my transmission.
 
I asked my mechanic if he felt we need to change the transmission fluid and he told me that I should leave well enough alone. The car drives well. 
 He said that because we don't know how long the fluid has been in there, that if we were to remove, we may be opening a can of worms...
Thoughts?
Regards
Steven

[teahead]

What color is it?  The fluid that is.

Has your car ever overheated?

Any problems with shifting?    Downshifting on its own?

Yes, I've heard instances where if  you had NEVER changed the fluid in say, 100k+ miles, to not change it as it may dislodge some junk and ruin it.

You fixed everything else...I say, take a chance  if it's black fluid and change it and if it messes up your trans, then just one more item you have redone.

[WRe]

Hi,
I have done it a few times, it's not a Pandora's box, see https://www.sl113.org/wiki/Automatic/Start.
...WRe

[StevenF]

no issues with shifting except a little sound when going from drive to reverse
no overheating --it did get very hot when I had AC on in stop and go traffic and once turned off, car cooled down fast

[teahead]

So it's NEVER EVER been changed (the fluid that is) that you know of?

And fluid color is reddish?  Not black and burnt smelling?

If so, and it shifts perfectly, then ya, let sleeping dogs lie.

Or...don't poke the bear.

[StevenF]

My mechanic said the fluid is pink--no burn no smell

We will leave well enough alone...