I do not work at a dealership. I work for a Indy shop.as a tech. But all I see is people bashing the dealer when these posts come up all the time. Changing the coolant for 1600 bucks may include those hoses. Thermostat and gasket. Coolant, labour shop supplies. The small things add up.
Go to another shop for a quote. That's really your best bet. And 2nd don't be alarmed at high prices for parts n labour....you own a m3. It's no dodge neon.
Sent from my HTC-X710a using Bimmer App