How often should you change your air filter in your car?

Question

How often should you change your air filter in your car?

Answer 1

Commonly, when you change your oil filter you should change the air filter.

So basically, when you change your oil. Every three thousand miles or so.

Answer 2

check, if it looks too dirty...change it=]

Answer 3

If it looks dirty change it.  

Answer 4

every 20000-30000 miles. if u drive a lot then more often.

Answer 5

every second oil change or 6-8 thou miles

Answer 6

suggested with oil change but if you're cheap you can blow it out with compressed air.

Answer 7

Every 9,000 miles, or when it is obviously dirty.  Depending on where you live.