as title really I know I depends on power and how its been looked after but generally what mileage will they done before getting tired?

well my 2003 Forester non turbo has 122k miles, no problems in the last 2 years of owning it, Idle Control Valve is currently being a bit temperamental but got a replacement on its way, expect it to last a good few years yet.

My Foz had 136k on the clock before I changed her....only had an intermittent CEL issue that didn't affect how it ran....was still sweet and smooth

It's not so much about the power (as long as it's standard) it is all about the way it's looked after. I've seen them with over 200000 on the clock and still running sweet.

Having said that, I've seen engines expire at 65000 as well. It's all down to the way they are treated and maintained.

http://www.subaruhighmileageclub.com