DD44,

Maybe you can install a sacrificial zinc somewhere in the system- similar to marine applications.

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81 300D Turbo 190K sold
83 300sd 319K best $500 I ever spent-daily driverw/ 2 tank WVO set up

The "sacrificial zinc" idea if they make them for use in coolant is a good idea.

However, I have owned various Vehicles since 1969 and before I owned my own vehicles it was uncommon for people to use any kind of Coolant other that Tap Water. None of my Fathers Cars ever developed Radiator leaks.

During all of that time I have owned vehicles I experienced 2 Radiator leaks at the Core Tubes. 1 was a Brass Radiator on a 30 year old 53 Chevy Pickup (the fist 25 years with Tap Water inside) and on a Car loaned to me by a friend that had Coolant. But, I believe it was the fact that it had an add on Coolant Fan Controller that had a Probe that you stuck between the Radiator Core/Fins; that is were it leaks. Installing the Probe bends and stresses the Core Tubes.

Between the use of Tap Water and later Coolant and Brass or Aluminum Radiators; with out checking either and I have kept the same Coolant in cars for as long as 5 years.

Also I take Car of my Car much better than my Neighbors do. Yet, electrolyses seems not to have been a problem with myself or my Neighbors.

I have on 3 different occasions replace Steel Freeze/Core Plugs.

So is it just a Mercedes problem?

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84 300D, 82 Volvo 244Gl Diesel

Paul,
The die cast thermostat housing is the sacrificial anode. Never coat the inside of it. They are cheap to replace when corroded.