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it really depends on the climate that you drive in, going 15k in a rainy environment the filter isn't going to show very little dirt. driving 15k in the city you never know how much build up is on that thing. I had an 06' Maxima come in with only 8k miles and there were pine needles and a little rats nest laying on top of the filter. With the filter being so easy to acces you might as well check it every oil change. It makes for a better driving experience.
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