Date registered: Mar 2010
Vehicle: 1989 560SEC, 1989 560SEL, 1995 E420
Mentioned: 6 Post(s)
Quoted: 548 Post(s)
Regarding the head gasket leak, I know one person who loosened each head bolt one at a time in the order they would normally be torqued and retorqued each bolt. This took care of his leak.
I wish I had remembered this trick recently on my Dad's M103. Unfortunately I pulled the head and now the car has been sitting for months.
Anyway, the driver's side head is seeping on my car, too, and I think before I go to all the work some day, I'll definitely try the retorque idea first. Seems to me the only possible downsides are the leak continues or you possibly strip some threads and have to do the job anyway.
I think what I'm hoping is that you'll try it!