I own a 260e.
#1 just happened recently. I had my alternator replaced. Haay gastos.
#2 medyo nangyayari na. Mahina aircon hehe
#3 happened once only. But it was because of a leak sa hose going to the heater. Madali ko naman naayos.
#4 never pa naman. But I always have a spare belt sa trunk
#5 has been a problem until recently. Ang dami namin suspetsa (clogged fuel system, fuel pump relay etc) so naka-ilang balik din sa talyer. Finally, nung pinalitan yung high tension wires, for some reason ok na siya. Salamat sa Diyos.

#8 is related to my #5 problem

#9 is related to my #1 problem. Although napansin ko, every morning when I start the engine, normal cranking siya pero hirap ng kaunti mag-start, unlike before na one click lang.
Magastos talaga mag-maintain ng benz.