+2 I do my best to avoid "Breakdown Maintenance". I have replaced a perfectly functioning crankshaft position sensor and a battery based on age. Next up is the alternator. I do not want to replace the alternator with one that is "available" because I find myself stranded on a road trip without much in the way of options. I will get a brand new OEM replacement and install it at my leisure here at my home.
My dad was a lead maintenance mechanic at a very large paper mill. They replaced functioning parts per a time schedule as preventative maintenance because down time there meant big $ lost with idle equipment and people. Lesson learned; Thanks dad!