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Most modern cars have rads that are made of a combination of aluminum and plastic. The most common failure is on the plastic parts. Years ago, I switched all our cars to MB coolant. Our 626's rad finally went out after 15 years, unheard of life for that model with the plastic rad. The Mazda mechanic was surprised at how long it lasted.
I have YET to replace a rad on a Mercedes. All our 190E's broke 400K with no rad replacement. Our 2.6 left a few weeks ago showing 399K and it's rad is fine.
Now, I'm sure people have had their own success with Prestone, or whatever, but for me, my own cars get the MB type as it has worked well for me.
Somethings do improve over time. While we gripe about MB late-model quality, some things are better. I still think that they've gone too far with oil change intervals and spark plug life, but coolant formulations and oil formulations have done nothing but get better. I'll "adopt" that new technology! MB's synthetic tranny fluid, in my opinion, is NOT fill for life, but the stuff is still amazing.
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