Need some advice. Am looking at a 1983 300DT (confirmed by Carfax) which has an 85 mph speedometer. I was under the impression that starting in 1983 model year, 300DT's had a 125 mph speedometer. Is this correct? If so, am I wrong to suspect that the car may have more miles than indicated.

I would be wary of this car also. The turbos had the higher mph on the speedo. At least my 83 300 turbo, 79 300 SD turbo and 85 300 SD turbo does.

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1977 300D Lost coolant while someone else was driving
1983 300D Can't run without oil
1985 300SD (gone but not forgotten)
1990 300TE 4matic Sold
1991 Yamaha Venture
1975 Kawsaki 250 triple
1974 Honda 200CL
1951 8N Ford
2008 Wildfire 650C

Yes, certainly the speedometer has been replaced somewhere along the line. It's highly likely the odometer is suspect.