11/14/2023
If you like mud and dirt inside your motor, you might like one of these reusable air filters.
These may have racing applications but in the desert, we have a lot of fine dust particles in the air.
I can guarantee 100% of the time using a filter like this long term in Arizona will create engine damage.
Fine dust particles will be sucked into your intake, wear out your piston rings and valve seats. After enough damage has been done, we sometimes find silt in the engine oil which can cause bearing damage.
The stock BMW air filter is our 1 # recommendation. With normal use, it should be checked every 12K miles. When riding off road, it should be checked after each ride or two.