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Date registered: May 2006
Vehicle: 2001 E320 - Brilliant Silver/Ash: 104,000+
Location: West Virginia, USA
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I would not use STP products in any of my cars, but that is only an un-educated personal opinion. I know nothing about Wynns products.
We have some rubbish in the US named GumOut too, and there are a lot more additives available than have been discussed here so far.
If you choose to believe your owner's manual, M-B says to use no gasoline additives of any kind. I think they are probably correct if you use only good (aka brand-name) fuel and change the fuel filter at the recommended intervals.
Mercedes Benz - Das beste oder nichts!