Welcome to the site--I have learned much here--you can, too.
First use the search function--this has been discussed many times. You may have to try several searches until you hit the right wording, but keep at it, the rewards are great.
In a nutshell 123 chasis cars have few problems-- climate control is one, and water leaks/ rust is the other.
The engines/trannys/ overall mechanicals, are BULLETPROOF!
Other items come up because the cars don't die at typical mileages--one of these is the driver's seat. Most cars are long in the junk yards before seats wear out. Not the Mercedes! When you sit in the seat pay attention whether the seat is straight and level. Compare it to the front passenger seat. If there is a difference figure on replacing it, or rebuilding it.