Just a note to remind that a worn synchro is a pretty strong indication that the car has been driven by someone that signifcanty moves the shift lever BEFORE the clutch is fully disengaged.

I agree, changing oil will probably change nothing.

Good luck,

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Larry Bible
'01 C Class, Six Speed
'84 Euro 240D, 533K miles
'88 300E 5 Speed
'81 300D Daughter's Car
Over 800,000 miles in
Mercedes automobiles