I CLEANED and oiled the K&N filter my truck had when I bought it. It went from 14 mpg regularly, to almost 18 regularly.
I used a K&N oil free washable filter for years without any issues. I only recently took it out when I moved to a CAI. I washed it about every 10K miles. Takes about ten minutes and I would just do it in the evening so it had all night to dry.
I just cleaned mine at 45k. Wasn’t very dirty, but followed instructions to a tee. Just used the cleaner, let it sit for a couple hours, rinsed with water, low pressure. Then I let it dry completely (like 3 days - I put in the original filter I still had as a temp). Once dried, oiled it enough to let it soak in as directed. Made sure nothing dripped. Popped it in and good to go for another 2 years.
I notice a difference immediately after cleaning my K&N, especially if it's after an off road adventure where I'm sucking dust from my lead. I've also noticed minor improvements in MPG when it's fresh and clean. I dunno about idle though, maybe? If yours was 19K miles, then it was 14,000 miles overdue so that's probably why.
I have a K&n on my 15 taco and so far no problem had it in for a year or two but to be safe a year and a half I oil and clean it every other oil change and haven’t had a problem my taco is 4.0 L AT
2000 2.4 here. Yup, runs better. I also just hate yanking out a filter and throwing it away every few thousand miles. Never had a map problem. I clean mine every other oil change. Probably excessive, never really dirty.
regular paper filters I would change around 9-10,000 miles. My K&N I clean every 3,000
Due to restrictions in SCCA Stock class rules, I only run a K&N panel... though dyno time revealed only marginal hp gains (really, its a poor ROI over the stock paper, but the K&N was part of a diagnostics test my team was doing, so it was free).
I had a K&N air filter in a NA engine VW. Some particles do get through as I could feel grit on the inside of the intake pipe past the airbox. I washed and oiled the filter per instructions.
I have had the washable type. Seemed like a lot of extra money and time to maybe get an extra horse and maybe fuel economy. I had just cleaned the filter and had to go somewhere. I threw in a fram air filter and didnt notice anything different.
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