An owner's manual provides much information that is needed by a person driving and maintaining an automobile. You ask a simple question that needs a complex answer. That answer is in the owner's manual and it depends on how and where you drive your car. Manuals are available on eBay for a few dollars or go to
https://www.Subaru.com/my-subaru/index.html.
Register and you can download the manual for your car in .pdf format
4..5 QUARTS
Remove the plastic shield marked: "oil filter and oil drain" on the splash guard under the motor.Easy to reach easy to change.
5 quarts
2011 Subaru Forester
It's a 17mm, but you could have discovered that by trying wrenches or sockets until one fit. --Ken
yes
Best thing to do is to get the fluids from your local Subaru parts department if possible.
2010 Subaru Forester with 2.5L engine
Just like changing engine oil only in a different location and with different oil.
My 2008 XT manual says 4.2 quarts.
The oil in your subaru forester should normally be changed every 10000 miles or if diffrent will state it in your user manual. On most occassions the car will tell you when it is due for a service or oil change by displaying a symbol like a spanner that flashes or by some other form which will easily be recognized as a service.
top of block pass side under edge of intake at front of motor