About every three thousand miles.
The best place to find a Subaru Legacy for sale is at a local Subaru dealership. The dealership will often have a selection of new and used Legacy's to choose from.
Should really flush your system every year to prevent any rusting or fouling, but at the very least every 2 years.
3000 miles
It would be best to change the timing belt at or before 100k miles.
Change it every 5,000 miles and you will be fine.
it should be changed every 100,000 miles
I change my oil in a 7.3 power stroke every 3000 miles no motor problems 240,000 on motor
If you drive normally change the oil/filter every 8,000 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.
How hard are you driving it? How often do you change the oil? What climate are you driving in? etc.? etc.?
Every three months or every 3,000 miles.
The manufacturer recommends you change the motor oil every 7500 miles, or every three months. As the vehicle gets older. It is recommended to change the oil more often.