Originally Posted By: byez
Recommended change interval for city driving? Does brand really matter?
VW recommended every 10k (miles). I decided to check every oil change, along with checking the air filter, which made it easy to remember. Living on a dirt road in the country, after replacing the original, and blowing out the new one, went 30K miles between needing to replace.
The note about "activated carbon" is spot on, though likely to lower the life due to more inherent air flow restriction.