Hello all,

I have a diesel 140 HP Dsg Yeti. Months ago I purchased a K and N air filter (for 140 HP Yeti) to install in my Yeti.The dealership advised me not to install it as it might void the warranty.

Now the warranty has ended a month ago,this issue doesnt bother me any more.

Should I go ahead and give the K and N a try?

Could it cause any damage?

Are there any of you using the filter?

I am much intrigued by the manufacturers claims of significant MPG improvement.

I know this subject has been chewed up in the past,but I would like to know your overall verdict.

Thank you,much appreciated.

Edited 15 October, 201312 yr by oriki

Have run cotton and labyrinthine foam filters in my cars for many years. They are very good, but will never produce the kind of output increases that are claimed on the side of the packet, particularly on a diesel. The issue isn't getting charge air into the cylinder (on a diesel, there is no throttle so the induction system, pre-turbo, is at atmospheric pressure), its getting what's in there to burn correctly and really importantly, within environmental constraints. Hence why any bodger can chip a diesel: you just bung more fuel in per cycle, the less you care about the black soot that comes out the other end the more power you can extract.

 

So long as its oiled correctly - they should look like they're covered in red wine, it'll be fine, in fact they are supposed to trap finer particulates more effectively than a paper element. In Israel, you may get more effective filtration over time from a cotton filter, depends how much bush driving you do.

 

When you need to service it, you can either buy the expensive cleaning fluid, or swill it out in a bucket of petrol. let it dry then spray on two to three coats of the K&N oil.

Answered in the other thread too!!

There have been concerns elsewhere of possible sensor contamination by the oil from the cotton, but I have never seen conclusive evidence of such.

Don't believe the fuel improvement!! At most it "might" give a slight increase in power, but no way a significant fuel consumption figure on its own.

Thank you for your learned observations.