My speedo shows me going 7-10mph faster than I'm actually going. I don't know how long it's been like that. My trip meter is correct - I measured it against mile markers. It seems like my odometer moves at the same rate as the trip meter, but if the speedo is running fast, does that mean I have less miles or more miles on the car than I think?

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1983 MB 300SD Turbo Diesel