Absolutely DO NOT use Dexcool with your type of radiator! I made that mistake a few years back in my older Toyota Pickup with a brass radiator and it quickly ate through the solder joints and ruined the radiator.

The best advice is to stick with the dealer supplied MB antifreeze, if you can't find any G-05. However, as long as you thoroughly flush your cooling system, just about any other type of antifreeze (except Dexcool) will be just fine. Just make sure you follow the change interval that is prescribed for that particular antifreeze.

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2000 c280 Sport (looks like an upgrade, feels like a downgrade)
1991 190e 2.3 (sold)