Hey guys, for those of you who want to replace the air filter on your 2010 RX 350 and are unable to find a replacement. Well, I finally found an air filter that will fit the RX without any problems or mods.
So, It turns out that our RX takes the same type and size filter as a 2010 Dodge Durango. Go figure. I found out the hard way by returning a few filter to different companies online and finally was able to find the correct one!
Anyway for those of you who are interested in replacing the filter here is the info: The brand name is AFE and the part # is 31-10218. They have both the oiled type or the dry type. I recommend the dry type so the oil doesn't mess with the MAF sensor and its a lifetime filter.
I got mine at Autoanything.com for about 49$

 

Just out of curiosity, why not use the lexus replacement air filter?

http://lexus.sewellparts.com/accesso...2010/2524.html

 

Thanks for the info! I've been using AFE filters for over a decade on my IS300 with an aftermarket intake. I just replace them when the time comes instead of washing. Have been using the non-oiled type in the past few years... used to be oiled originally. No issues.

 

K&N filters are fine. Notice when they are new out of the box they are not dripping wet. Same has to be said when YOU clean them. Just don't go all out on the oil and you will be fine.

I actually get another 30 miles to the tank now by this simple mod.

 

The Lexus oem filter is not a lifetime filter but it is cheaper. I just don't want to be changing filters plus I'll see if there's difference in fuel economy with the AFE. I don't care about HP increase b/c the RX is by no means a performance vehicle.

 

> I actually get another 30 miles to the tank now by this simple mod.

can you explain "what mod" is gaining you 30 extra miles per tank? That is SIGNIFICANT!

 

I think he is claiming that changing to a K&N filter is giving him an extra 30 miles per tank. This is either a huge exaggeration or his old air filter was clogged beyond belief...

 

Just posting what I see. I wasn't getting anywhere but around 300/tank either me or the wife driving it. Of course its an estimation.. I've seen this with about 5 tanks since I got the K&N.

We do about 35% highway and 65% city and most of the time its on eco. Don't really floor the car like someone else said.. I have other vehicles for that. The air filter was a bit dirty but not enough to be clogged beyond belief.

The RX feels like it breathes a lot easier compared to the oem air filter.

 

Which K&N did you install? what year RX?
30 miles per tank, on avg. 15 gal fill up, = 2 mpg increase... does your reading show a consistent 2mpg increase, assuming all else equal as you suggest? If so, quite impressive. I have installed K&N in a few cars in the past, I have found their effectiveness was mostly a factor of how restricted the factory air intake was. I would think Lexus has fine tuned this by now, but maybe that is not the case?

 

I have also found a good way to get 2 mpg increase is to wait for warmer weather...

 

Read this before buying a K&N http://forums.nicoclub.com/debunking...r-t180100.html
I had used them for years in several cars, not anymore. Just replace the factory filter (or AC Delco or Wix or Purlolator or Fram) every 10,000 miles to keep it at max air flow.

 

Quite often, a product comes on the market and fills a niche. I think in yesteryear, K&N recognized that many air intakes were too restrictive, i.e. surface filter area was too small.... a larger filter area would allow for ease of air intake, creating more horsepower and efficiency. I installed them in several rigs, the last one, a 98 Jeep GC. It made a huge difference. However, it seems car makers have caught on to this fact as they strive for every extra bit of fuel economy and performance, for the least amount of cost. My guess is, most car makers have addressed this, unlike years gone by. So often we continue to buy products, cause they worked before. In the end, a problem can only be fixed, if there is a problem to begin with. Most people don't never have enough information to understand if they have restricted air flow, and the potential benefits of improving such.
Great link... although, greater air flow can often come as a result of more surface area....not always at the expense of less filtering capability. Regardless, great article demonstrating what happens when products are actually tested against competing products.... which is rare rare, unfortunately.