how does this additive affect that? Or is your point that its beneficial effects are in helping clean up the carbon deposits on the valve stems and, hence, better fuel input into the combustion chamber? Are these effects noticeable with the very first can of the stuff, or does it take a few tankfuls to notice?

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1988 California version 260E (W124)
Anthracite Grey/Palomino
Owned since new and still going strong and smooth
MBCA member

Past Mercedes-Benz:
1986 190E Baby Benz
1967 230 Inherited from mom when she downsized
1959 220S Introduced me to the joys of keepin' 'em goin'

There are only 10 kinds of people in the world--those who understand binary and those who don't