Which air filter are you referring to? The engine air filter, or the cabin air filter?
Air filters can vary depending on what vehicle you need the air filter for. The cheapest cost ever found on an air filter is around twenty dollars, not including tax.
not necesarily but it definitely will affect the power... if its dirty just change it they don't cost very much
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The cost of and air filter is dependent upon the make and model of your automobile. The average cost of the air filter is $25. Most mechanic facilities will replace the air filter without any additional charge.
The filter cost about the same from an auto parts store as it does from 'Jiffy Lube' and they will install it for you when you change your oil. It's easy to change and is located behind your glove box. This is a website that will show you how it works. http://www.toyotaownersonline.com/parts-service/toyota_parts/cabinairfilters.html
YES! Never change the oil without changing the filter. Not changing the filter will save you what, 5 bucks. Replacing the engine that you will blow in the process will cost, maybe $800 to $1200. Do the math then go out and CHANGE THE FILTER. Put an air filter in it while you are at it.
No, change your air filter every 30,000 miles.