Stock Motorcraft filters.

 

Used and new engine air filters, changed at 1 year, 19K miles:

 

Never bothered to read about it in the owners manual, but does the cabin filter, filter outside air coming in, or inside air?

 

I think both.

 

Just FYI, if you ever get an elusive funny smell in the cab, this is a good place to look (& replace!)

 

Mine was gross as well when I swapped it out.

 

Thanks for the advice everyone

 

Just changed mine for the first time today. Truck has been dealer serviced since brand new and never mentioned until this service about it. I never had one in my previous gen truck so I plead ignorance also. Dealer price was crazy for it also. I am in Ontario and dealership wanted 55 bucks for filter and then 27 bucks to install it. I said pass. Bought filter on rock auto and converted to Canadian including shipping and duty worked out to like 30 bucks. Took 10 minutes to change it out thanks to the YouTube video. Could not believe how dirty it was. Truck has 37000 kms on it and less than 2 years old. This will be changed more frequently by me in the future.

 

My wife had her Fockus in for oil and stuff about a month ago. The dealer suggested her filter was needing to be changed, $75. Some guy overheard the conversation, and said "Have your husband do it for less than half that". She thought that sounded good. I gave her $75.

 

Fixed it for ya