I travel very frequently for work. Every rental I’ve had goes through the following tests

Rented a Shelby Hertz GT-H. Changed the tires and rims. Removed the metal traction control defeat from behind the button. Drifted it for 90% of the allotted mileage. Put back on the original tires and rims. Returned it. Sorry to whoever bought it, but dang, that thing was fun.

So based on the fact it took 50k for the filter to become dirty enough to clean do you think it is actually filtering out all the dirt?