Well this is a four speed. I am pretty sure that 3 grand is about right. The button is the downshift button and going that fast you would need to depress it to downshift. At lower speeds, you can just depress the pedal and it will downshift and if you hit the button it will double downshift..and set you back in your seat!
'86 420SE Euro
904 Midnight Blue, Gray Velour
Dad bought it new, now I own it.
"A Mercedes-Benz is like a fine wine, it only gets better with age."