In the past few days I have been letting my engine run hotter than normal (over 100C). Initially, I noticed this really strong chemical smell, and black smoke on hard acceleration.

After a day or two, the smell and smoke are gone. The car did idle a bit rough after doing this, but that is smoothing out. I would like to run it flat-out at 100+ mph for a while to really clean it out.

Jet -- I never heard of PowerFoam, but have used Z-Max with great success up until about a year ago, when I could no longer find it at my local stores.

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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