It's actually quite simple...
...you either come across a car that was cared for and serviced at the recommended intervals, or you discover one that has been neglected to the point that premature component failures ultimately require complete drivetrain replacement at an early life.
2009 ML350 (84K) - Family vehicle
2001 CLK430 Cabriolet (71K) - Wife's car
2005 BMW 645CI (124K) - My daily driver
2012 Mustang V6 (60K) - Daughter's car