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It sounds like a few around here need to "think outside the box" and not assume the tech or the MB tech dept is trying to ruin/make money off this guy. Very often the techs at the tech center will have info from all over the country on ideas which are "fixing" certain conditions. If the tech at the tech center says to try 87 octane (and the dealer is willing to put this in writing on the work order) then I'd try it. I wouldn't continue to use it if it created problems, and i wouldn't let the dealer say that you now have a code caused by using 87 octane gas.
There was a time when we were advising cusomers to run mid-grade as opposed to premium fuel on mid-90's 104 engines to cure a "false start" condition when cold, it fixed the problem just fine.
Gilly
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