Also, look out for climate control issues. The aluminum OEM evaporator core was prone to failure (replacement is copper). Replacement costs are high due to labor involved in ripping the whole dash out in order to access the evap.

Cooling system components begin to deteriorate as well. Coolant pump and radiator neck crack are the most common. Replacement radiator has a metal reinforcement metal insert in the neck.

Smaller issues are the variety of senders (oil pressure, coolant level, etc.) Also, some minor power window mechanism parts give problems. Same with the power headrests. Most are all inexpensive to fix and DIY in an hour or less.

I would add that of the major issues mentioned, a good example with more than 100K miles will most likely have had those major items replaced.

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2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car