A K&N cold air filter will not hurt , as long as you are committed to regularly cleaning & oiling the filter.
I also ordered a K&N drop in filter.
Upgrade to a K&N filter and a recharge kit. With a washable filter, you simply pop it out, clean it, let it dry and apply the oil... Pop it back in the vehicle... Good to go! Guess what? You SAVED money!!
P.S. this same Toyota dealership told me I needed a new air filter upon which I told him, “It’s a K&N...” he said oh, and walked back into the garage.
Rolled the dice and bought an Amazon Warehouse Chinese cold air intake for $42. Figured the bent aluminum tube was the most crucial part of the set up apart from the air filter so I bought a K&N air filter to replace the crummy one that comes with it. Makes some nice induction noises now.
I clean mine in a bucket with simple green, and re-oil with whatever motorcycle filter oil I have on my shelf. I do this once a year. Keep in mind, your filter does basically nothing after all the oil is saturated with dirt.I've had the recharge kits before and simple green is both cheaper and works better. I've been doing this for many years and have never had one degrade, as it is a very gentle cleaner.
I've been using a K&N for a few weeks. I haven't noticed any power gains, but the throttle response feels slightly quicker (this could be in my head, but who cares, I'm happy). No difference in fuel economy.
IMHO the performance gains from the K&N are marginal at best, especially on a 1.8 litre motor. It's less hassle to just replace the paper filter element every year with a freash one than cleaning the cotton filter annually. the K&N will likely require eight years to get your return on investment. Besides it you live anywhere where it's dusty you going to be doing your motor harm... I read about farm trucks with these installed the puke their motors because fine particles are getting into the motor. YMMV.
IMO they're not worth it. Modern intake systems flow fairly well, adding a K&N filter will provide almost no benefit. Hell even adding an aftermarket intake these days add nothing but sound. they can also get oil residue on the MAF sensor which can be expensive to replace.
I had a green filter on for about 5k miles and I noticed it let a ton of pollen into the intake. I switched back to the OEM paper filter and the pollen was cut down substantially.
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