Hmmm.......here goes. A/C evaporator, engine wiring harness, assorted front end parts, leaky steering boxes and pumps, catalytic converters, pneumatic locking/closing assist pumps, window motors and regulators, climate control blower motor and regulator, throttle actuators and traction system stuff........

If you own a W140 long enough, you're quite likely to have issues with these systems at some point. Proceed with caution.