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.....
3000 miles
Change it every 5,000 miles and you will be fine.
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.
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.
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.....
The Outback
The air conditioner is a closed loop system, and therefore requires little maintenance other than what your owners manual specifies. If you notice decreased performance (less cold coming out of the vents), It is time to take it to the Subaru dealer or an a/c specialist and have your air conditioning system recharged.
How hard are you driving it? How often do you change the oil? What climate are you driving in? etc.? etc.?
An outback hat is usually brown, protective from the sun, and sometimes has a string attached to it. Outback hats are often used by adventurous people who spend a lot of time outside. Indiana Jones is known for his outback hat.