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Hi all new to the forum... I went through a ton of threads looking for something about air filters and didn't find much so figured I'd start this one. Looking for thoughts/experiences on OEM vs. K&N. Just installed the K&N filter on my '07 4.7. I've used K&Ns for forever simply because they'll pay for themselves over time regardless of whether or not theyll add hp, mpg. Reading more how oiled filters aren't the way to go though. Live in a very dusty environment (vegas). I did have to replace the MAF sensor in a Grand Prix I owned previously. I just figure don't use too much oil for cleanings moving forward and I'll be fine? Thoughts?? Also changing plugs and decided on OEM copper Champions thanks to what I read here. Right now I get 12/14 mpg. Thanks...
 

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I bough an AFE pro dry so I wouldn't have to be worried about oiling the filter, I like it gained about .5-1mpg with it so it was worth it also don't have to buy an air filter again.
 

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Wow that's good I get 13 city and about 17.5 on highway with the 4.7, what spark plugs are you running.
Whatever Chrysler put in it, I only have 18k on it. I had issues with the MDS/VVT not working correctly from day one. The dealer reflashed the ECU with later version of software and I have gotten great mileage ever since then. Its important that you take your Jeep to the dealer periodically to get updates to the software. The engineers are constantly making changes to engine management(at least that is what I have been told by a reliable source)
 

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The oiled cloth filters (like the K&N) give better airflow because they have larger openings in the filtering media to let the air flow through. They rely on the oil in the cloth to attract and catch the dirt particles.

I have seen some tests, amateur but scientific non the less, showing that more dirt passed through the oiled cloth filters then the paper filters. At the same time, the oil cloth filters, like the K&N have been used by thousands of vehicles over years, and I have NOT seen any complaints of wear or damage that would be caused by dirt making it past the filter. So, you can argue the extra dirt that makes it past the oiled cloth filter isn't enough to worry about.

AFA performance, I don't know for the Commander, but most vehicles just switching to a K&N in the stock air intake system offers very little if any performance gain. If you switch to a cold air intake that replaces the whole air intake system (up to the throttle body) does offer a noticeable gain in a lot of vehicles, but NOT all.

An extreme dusty environment like Las Vegas? Personally, I'd play it safe and stick with good paper filters, but I'd have to agree, you probably wouldn't find any extra wear or damage because you used a K&N or other good quality oiled cloth filter, if that is what you want to do.
 

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Oil is better performance and paper is for longevity is the the bottom line with not much difference really between the two?


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Have to agree with Mongo here, I did a lot of reading on filters when looking for one for my long gone Durango. K&N and other oiled filters do not offer nearly as much protection as the paper ones. THey flow better only because they filter worse. AFE Pro-Dry S is by far the best filter you can buy in terms of performance and filtering abilities.
 
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