it should be changed every 100,000 miles
If it is the synthetic blend, you should change the oil every 3,000 miles. If it is a full synthetic, you should change the oil every 5,000 miles.
Change it every 5,000 miles and you will be fine.
Most vehicles recommend changing the timing belt every 60,000 miles.
It would be best to change the timing belt at or before 100k miles.
The recommended replacement for the Timing Belt (aka Camshaft Drive Belt) on the H-4 is 48 months or 60,000 miles. The 3.0 Liter H-6 has Timing Chains with no Periodic Inspection and/or replacement required.....
About every three thousand miles.
I don't know, I trew mine out. My wife's grandpa didn't have a cabin filter in his car and died at the ripe age of 98.....
How often should you change the fuel filter?
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.
The Outback
Should really flush your system every year to prevent any rusting or fouling, but at the very least every 2 years.