Originally Posted by Clockwork

thats overkill unless you live in an area where the fuel is potentially not that clean.
sputtering or loss of power are give aways to a failing filter. I just did 180k kms on my original filter using only premium fuels and I had no reason to replace it. Just did for maintenance and honestly I was going to check out the brake lines for corrosion so may as well go balls deep in the job, and it WAS a good practise to do since I was in there fixing up stuff anyhow. peace of mind I guess.
30k kms is wayyyyyy too often in Canada... Not sure about Bulgaria tho.