when it is dirty
How often should you change the fuel filter?
Change the oil filter every time you change the oil.
You should change a furnace filter every 2-4 months.
Every 30,000 miles.
70,000 miles
The amount of time you run the air conditioner depends on how often you should change the filter. Generally you should change the filter at least once every 5-6 months of use.
Your tank filter should be changed every month. If your filter becomes clogged, it should be changed right away.
Depending on how much you drive your car should be how often you change your air filter. Sources say you should change it when you go to get your oil changed cause they both last about the same time.
every 12000 miles
Every 2 years
Whenever it gets dirty.
Every other oil change.