We got a 2010 Outback last year and after not being able to find a dipstick for the Automatic Transmission, I discovered that it has a CVT, which I had never heard of before. The previous owner said he did a drain and refill of the transmission, which probably means about half of the fluid was changed. The car has 178,000 miles on it and I read on Google that a CVT has a shorter life expectancy than a regular AT. Looking for recommendations on whether I should do a flush or not? Sounds like I would need to take it to someone that has the equipment for a flush? The CVT is performing flawlessly so far. I have been doing some light trailer towing though. 

Subaru says change it in Canada and severe conditions. I take that to mean change it for any high mileage Subaru. Particularly one with an unknown history.