An update: Yesterday I got the car up on ramps and changed the oil to Castrol Edge 5w30. I did not replace the 1WPY-14-302 filter as it's still new. I did install a Fumoto F106N oil drain valve ($23 on Amazon) and picked up 10 feet of drain hose at Home Depot for $3+, so next time the change will go fast and easy. I noted that the access panel was missing one of its two screws (again, thanks Mr. Dealer! who just changed the oil 2 weeks ago) so I will get a replacement. Meanwhile, regarding the other two fastening points: Those stupid plastic push fasteners are not easy to re-insert, are they? In the many cars I've maintained, I've never seen these used on a frequently removed panel. (On other hand, it was 22 deg. here in Chicago area yesterday, so my fingers were a bit numb.) Kudos to Mazda for a very easily accessible drain plug and filter.