While I can't help you with a car, I share your desire of wanting things with replaceable parts, so I leave you with this, the coffee maker version your salad spinner, https://us.moccamaster.com. All parts replaceable.
or in some cases even upgrade to improve capabilities...
I did the gaggiauino mod to my gaggia classic and basically everything in there is just pipes and wires... the most complicated single part on the original is the vibratory pump. I'm pretty sure i could keep that same machine going indefinitely with access to parts.