Ford Focus ST Forum banner
1 - 4 of 4 Posts

4,368 Posts
It depends more on the environment you drive in.
More dust means more frequent replacements.
The OEM filter has a pretty long life,, 25k, maybe more.

However the in-cabin air filter I change every 6 months.
1 - 4 of 4 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.