m3bmw

Members....any instructions or tips on how to change the two air intake filters on my 08 CLS AMG? I was able to get the 6-7 screws out of the cover, but it still will not budge. Am I missing something else?
Any help would be great.
Do you recommend K&N or another brand.
Frank

m3bmw

Well I found an instructional video on the net. I was trying to take the metal cover off the top of the engine. The video shows the air filters are under a rubber cover on the far upper left. I was able to locate them and will order K&N brand.
Frank

AMGAffalterbach

If you have the CLS63 AMG do NOT go with K&N Filters!!! They are oil-based (old technology first off) and have commonly caused MAF sensors to fail (not an issue on the supercharged CLS55 which have MAP sensors) because the oil from the filters will slowly build up and foul out the MAF - not an inexpensive part to have to replace. Usually you'll be fine for a year or so but end up having to replace your fouled out sensor.

StarvingArtist

I just swapped my K&N's for oem, because they are not stopping all the dirt! Hold one up to the sun and you can see what size dust gets through. Not good.

AMGAffalterbach

That's true too, they actually don't filter down to the same tolerances either and over time can't be good for your engine. But on the bright side it's only a $27,000 crate engine used

dyno

so, what's the new tech with air filters then ?

AMGAffalterbach

Well, I'm no expert but:

dyno

.. I see

AMGAffalterbach

My point is the dry filter technology is good enough to where oil filters aren't *really* necessary, the modern materials out there are good enough that it doesn't make sense to put a K&N on a naturally aspirated M156 where, if by user error or the natural course of filter usage, it fouls the MAF sensor. I'm aware this is controversial and K&N outright denies it on their website but with an argument I just don't trust. I know you drive a CLS55 and it doesn't have a MAF sensor, but it's also known - and many on this forum share the same opinion - that the K&Ns don't filter out down to the same tolerances the OEM ones do.

dyno

besides the possible MAF issue it would be interesting to know more about recent developments in air filter materials &technology ..
I 'm really not up to date in this.
I remained where:
a- stock "paper" filters are very obstructive for filtering down to certain tolerances (which ones ..?!)

b- "sport filters" such as those PU/foam-based or cotton-based (as K&N, BMC, chinese clones ..) could avoid such over obstruction combining a thinner core material (cotton or foam that is) AND by applying a thin layer of low-viscosity oil.

btw, if that meets certain tolerances or not, should not be left to just opinions ..
sure, both technologies are very old ...at least 30years
and nowadays, AFAIK, the core materials of both a) and b) technologies are still the same .. but I could be wrong as I didn't pay attention to this lately.

that's why I was interested in this, also because it seems really weird that just this domain has not been affected by the innovations and new findings concerning polymers and nanoparticles...

now, again, I really don't know what kind of paper material the car industry
actually employs for the original or aftermarket air intake filters,
but, on the other hand, it seems to me that the sister industry of Heavy-duty vehicles is much far ahead in these applications:
http://www.donaldson.com/en/engine/s...ary/059806.pdf