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The plugs are correct Bosch ones from the Mercedes dealer. These cars are very sensitive to plugs, so no cutting corners here.
Must be a coincidence. If the plugs were wrong, I guess I would get poor F/E form that time on. But the tendency is that it's getting worse and worse.
I am also contemplating replacing the temperature sensors. There are 3-4 temp sensors on this car and they DO affect the A/R ratio thus F/E.
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W124 300E 1993 M104  / 
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