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OK, my dealer said my air filter was fine at the 22,500 service, I asked him to just change it but he said it was fine, "just look at the air intake gauge, when it gets close to the red line then its time to change it". Oh OK. I have had this truck since new and that was over 2 years ago in May of 2010 when I bought it. I'm old school and today I said to myself, "pick up the 2 air filters and just change them". I don't think I will go over 2 years again. I have 28K miles on my truck and maybe 100 miles have been on dirt. Here's what I found.
I change the air filter and the fuel filter every 15,000 miles, regardless if it needs it or not. The air filter looks just as dirty as the one you have posted when I change every 15,000 miles. I changed the pre-filter as well at 15K and 30K miles but it did not look dirty either time so I think I will change every 30K from here on out.
I bought these ones from the dealer for $53 for both. I'm kind of thinking that the pre-filter foam one can be washed, dried, and then reuse it because it wasn't really to bad.
Guess the gauge only goes to red when the filter is packed with snow
If Ford's strategy allows the air filter to get worst than Ricks filter via the vacuum gauge, think about the OLM strategy and when it tells you it's time to change your oil!
There was an interesting article on air filters in the October 2012 issue of Trailer Life magazine. They said a filter became more effective at is got dirtier. They only need changing when they became so clogged that they were causing a shortage of air. On fuel injection engines the fuel was metered according to the air the engine took in. Only when performance was effected did you need to change filters. the need was more noticeable when towing heavy loads. This was an interesting article.