My 100k SEL has gradually gotten harder to start when cold. It now takes two attempts before it will stay running. Also, the idle has never been as smooth as it should be.
Problem number two is that when going over potholes I hear a distinct knocking noise coming from the front suspension. This has also gotten worse with time. I raised the car on my lift and checked for loose parts but couldn't find anything obvious.
Don't be afraid to go into detail. I have mechanical experience, just none with MB.