My 300E had the valve seals only, at least they showed up as being changed in the records. The car was using ZERO oil between changes before having other problems which were not the fault of the engine.
Replace the seals with the good V/G seals available from the parts shop and watch your oil consumption improve drastically.
'84 Euro 240D, 523K miles
'88 300E 5 Speed
'81 300D Daughter's Car
Over 800,000 miles in