It's too soon for a victory lap but I will report that steam, which I thought was just condensation (even after the engine reach operating temp), is no longer coming from my exhaust after using Steel Seal (added it last night).

I also had/have an issue with small amounts of oil in the coolant. If that has also stopped I will be delighted.

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2008 E350 4matic / Black/Anthracite

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Gone but not Forgotten:
2001 E430 4matic, 206,xxx miles, Black/Charcoal
1995 E320, 252,xxx miles, Black/Grey
1989 260E, 223,00 miles, Black/Black