W124 1994 Starting noise

[Rufus6946]

Hello I have a strange noise when I start my car. It is a loud low down whine that lasts for about 30 seconds then disappears. It does not happen again until the engine is cold normally 1st thing in the morning. My mechanic says that it is just the noise that most mercs when they are getting a bit old make when they are warming up but I just want a second opinion.

Thanks Ralph.