Had an f150 ecoboost that I took in to ford for misfire, CEL, and low power (compression). Turned out the issue was a plugged catalytic converter...from a leaking injector(s). Anyways, ford covered the repair under the emissions warranty, but also informed me that my K&N oiled filter was insufficient at filtration and had "dusted" the engine (they had pictures to prove it), and thus my powertrain warranty was null and void. I got rid of that truck. From that day, I will NEVER use an oiled filter or any aftermarket air box intake contraption. Ever again. Simply not worth it. None of them actually filter worth a shit and if there is ever a sniff of a related problem, the manufacturer will void your warranty with the snap of a finger.
As a farmer, I take air filter maintenance very seriously on my equipment, especially the combines. The risk of compromising on filters or maintenance is just too high, and ungodly expensive. Turbocharged engines must have exceptional intake filtration, and restriction/dirt load of the filter plays a role in that. "High flow" means "high wear". Simple as that. You want your engine to last?...stick with the factory intake and filter. Inspect the filter (and intake tube) every oil change, replace the filter yearly, and make damn sure that air box is buckled up and sealed perfectly.
As a farmer, I take air filter maintenance very seriously on my equipment, especially the combines. The risk of compromising on filters or maintenance is just too high, and ungodly expensive. Turbocharged engines must have exceptional intake filtration, and restriction/dirt load of the filter plays a role in that. "High flow" means "high wear". Simple as that. You want your engine to last?...stick with the factory intake and filter. Inspect the filter (and intake tube) every oil change, replace the filter yearly, and make damn sure that air box is buckled up and sealed perfectly.
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