Radiator leaked; replaced with all-metallic unit ~120000.
CV joints and half-shafts replaced ~165000 miles.
Air intake hose (from the airbox/mass-flow sensor to the intake manifold) began to crack and leak with age and heat at ~180k, resulting in stumbling and stalling, reduced fuel economy, and causing the transmission to hunt down to second speed much of the time. After a few months with duck tape around the cracks (which helped), the $50 replacement from NAPA made all of that go away.
Horn switch isolating foam collapsed last night (which led me to this site.) I made the added-foam repair today and we'll see whether I need to go spend the $14 for the horn switch assembly.
Poor bodyshop work after a sideswipe collision in '93 caused rust in the right quarter panel and rear strut towers. This hasn't stopped us yet.
The sunroof and windows have developed a lot of drag, so that the sunroof can't be driven by its motor anymore (but I can use the manual crank) and the window motors strain to raise and lower the glass, especially in cold weather.
The dealer service for the first 120,000 miles included not only oil changes every 3k, but thorough seat/door/hinge/latch/body lube as well as all the mfr-recommended stuff. With this kind of care, and gentle driving, this car remains reliable.
It's nimble, comfortable, peppy without danger, secure in snow, reliable and economical (35 mpg hwy), and good-looking. Our LX has power windows, locks, mirrors and sunroof, auto trans, and power steering and brakes. And retractable cupholders. And adjustable lumbar support. The passive shoulder belts are preferable to airbags, and the lack of the more-recently developed ABS hasn't hurt us yet; Mazda brakes have always had very good feedback and modulation. The stem-mounted light and wiper controls are superior.
In my opinion, Mazda is the most undervalued marque in the market. (No offense to Hyundai and Kia)