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Have the same problem with my '90 300SE. Heck, for $10 I'll give it a shot. I've already ran Techron and Gumout through there with minor improvements, but nothing dramatic. WOT does not seem to be affected......
It does look like you were thorough in your tests, and the erroneous readings might be the real issue, or at least AN issue. I have always suspected that most fuel additives give a mostly placebo effect, but I'll try it anyway.
I'm also gonna try the tests you did, and see what I get.
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-tp
1990 300SE "Corinne"- 145k daily driver - street modified differential - PARTING OUT OR SELLING SOON - PORTLAND OR. AREA - PM ME FOR DETAILS
1988 560SEL "Gunther"- 190K passes anything except a gas station
1997 S420 - 265k just bought it with a rebuilt trans. Lovely condition
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