If the antifreeze is changed as stated in the maintnance manual there will not be any problems with it. One thing we see is when maintenance is not performed properly the vehicles tend to have more problems than normal. Mercedes has done exclusive testing and the Mercedes antifreeze was designed for these vehicles. There is a myth that attracts people ( 100,000 mile spark plugs , 100,000 mile antifreeze etc) we know this cannot happen due to differant driving conditions and temperature. If you think you can go 15,000 miles in between oil changes ,well you will have problems down the road. There is no way around replacing these fluids and components at proper intervals. I have made this clear to our customers cause they want their car to last longer than 100,000 miles. But the ultimate decision is yours (the owner) We just give professional advice.