I purchased a gallon of coolant from the MB dealer and had to pay $25. I think the price is outrageous. Does anyone have recommendation on where to purchase coolant at a reasonable price.

 

If you want OE Coolant/Antifreeze, that's what you're going to have to pay. Or, you can do what many others do...go to AutoZone and buy some, mix it 40/60. Well, I mix it 40/60 for where I live. As far as scale and residue preclusion, I mix the water with 12oz of Purple Ice (because it's better than WaterWetter (no oily residue to sit on top of the coolant making it look nasty). Vehicle runs cooler and you don't have to worry about build-up, corrosion, or scale deposits. And it's a whole lot cheaper. But that's me. However, it works!