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.

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.

I've been using K&N filters for years and never yet seen an issue with oil contamination of sensors off the filter...   unless you drench the thing in oil it just isn't going to happen.

My Yeti had one installed when it had its first service at 9,000 miles - no issues to report and it was in there for 20,000 miles before it was replaced by the ITG intake.

I guess I just don't see the point on a diesel. What are you trying to achieve with it?

I wonder too what the O/P is trying to achieve. The only real purpose for an aftermarket filter (unless as part of an extensive tuning programme where the original restricts flow and power) is that they are able to be cleaned and re-used and can save on service costs. It may be that is a good move if you drive in very dusty conditions where frequent filter changes may prove a significant expense.

And with a reasonable discount, a genuine air filter from a dealer isn't exactly expensive. With all the thousands I've spent on upgrades and tuning on my Octavia, it's only ever had OEM filters.

Remember that the OP is in Israel, which is much drier and dustier than here, and still has a lot of unsurfaced roads.

 

A friend has moved to Crete which is similar and he has found that his Freelander needs a new airfilter a lot more often than in wet and muddy UK.

 

The only car I ever fitted a K & N was a tuned rear engined Rapid and it did make a difference in that, and I would agree with Nick, their use for "performance" in a diesel is doubtful without major work elsewhere.

I can see theoretical benefits for petrol engines, which are air-limited in terms of performance, but for a diesel where air supply is not the limiting factor, I'd be very cynical about significant performance or efficiency claims.  The only clear benefit I can see is the ability to clean and re-use.

Thank you my friends for your observations.

I shall stay with the paper original filter.

I understand now that buying a K and N filter for a diesel is a complete waste of money!

Thhank you all!