[devander1942]

We will soon have 30k miles on our 2017 Forester. Dealer recommends a trans-flush ($450!). Does this seem reasonable for a car driven easily?

 

[adc]

Lengthy thread about this:
https://www.subaruforester.org/vbul...c-transmission-fluid-change-procedure-787207/

If done make sure the dealer knows what he is doing. You can at least ask. And will it be all the oil.
You can make up your own mind. Since I am capable of that I aim to do a simple drain and fill like in my other AT's But it is necessary to get new oil in there IMHO