Originally Posted By: MrQuackers
^just marketing to sell more Ultras. I'm sure Extra Guards would have no problem with ~7.5-10k mile non-severe OCIs. I bet Dave has been even more daring.
The miles of use for the filters are the recommendations that have to take into consideration every vehicle on the road. Of course if an engine is pretty new and is clean insid, then most any filter could be used longer than the recommended use given by the manufacturer.