Air filters and filter care: the cheapest power you own
A clogged air filter costs more power than most bolt-ons add, and it is the only part in this section that gets worse every mile you drive.
The real decision is disposable paper versus a washable reusable filter. Paper is cheap, filters slightly finer and gets thrown away. Oiled cotton gauze flows better, lasts the life of the truck and needs cleaning and re-oiling on a schedule. Over-oiling is the classic mistake and it will foul a mass airflow sensor. Dry synthetic sits between the two and needs no oil at all. On a dusty trail truck, filtration efficiency matters more than peak flow.
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Cleaning kits, oil and service intervals
A reusable filter is only better than paper if it actually gets serviced. Cleaner and oil are sold as a kit for that reason, and the interval depends on where you drive far more than on how far. A dusty summer can shorten it to a few thousand miles.
Cabin filters live in here too, and are the one filter most owners have never changed. We stock 373 filter and filter care parts from 2 brands, matched to the engine and model year rather than the badge on the tailgate.