transmission loss

1990 Mercedes Benz 230E. (W124 chassis). 4-speed automatic transmission. Overhauled transmission five years ago. Valve body needed professional cleaning twice since the overhaul when none of the gears would engage. Results of the first cleaning lasted for about two years. Second cleaning only...

Hello lovely people:) My first time posting a question! Please some one tell me what to do. My beloved SL600 (2006, 50,000 miles) has a problem. After a few miles of driving it I hear an unusual whistle sound which I can only assume to be the turbo. After a few miles more, the car feels like it...