1. Not normal, indicative of leaking air suspension valve(s).
2. Valves out of adjustment?
3. This is known as 'flaring', perhaps trans modulator is stuck/ out of adjustment.
4. Somebody has disassembled and subsequently miswired turnsignal stalk wiring, perhaps.
5. X2 on Jamie Kop's instructions. He has/ had a 109 he was freshening up and documenting on his website. Hasn't been updated in awhile.

Some wise person once said "garages kill", meaning, long periods of inactivity are bad for MB cars. Good luck and keep us posted.