My first MB diesel car was a 79 300td with 385k on a stooped odo ,the unknown mileage added from the sellers was somewere around 100k ,I put on an additional 65 k .It was just north of 500k when I sold it for $1000.Im sure its still putting around somewhere out their.My current 84 300cd has a stopped odo that I purchased that way,reads 256k,Ive put 75k miles on it in the last 3yrs ,its probably reaching the 400k zone real soon.You change the oil regularly and new filter and fluid for the trannie once a year your golden .Oh yeah ,the valve adjustments just a plus.