To each in their own experience. All the K&N air filters I purchased new appeared to be pre-oiled the correct amount. Once every year I use the K&N recharge kit and clean and oil my air filters. Some of the benefits are better fuel mileage, cleaner intakes,make more power etc. I have seen from my tuner that the installation of K&N air filters on our cars will make power I’ve seen 1-5 whp nothing you will ever actually feel though on the butt dyno.
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Mr. Clean
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