Dumb question. Are you measuring "cold" with engine running or off? With engine off my 300SDL shows fluid way above top mark, but correct level while running. It scared me first time I looked at it with engine off.

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Joe Myers

'83 300D (light blue)
'82 300TD (off white - parked)
'87 300SDL (silver)

'75 300D (black - sold)
'76 300D (beige - totaled by pizza delivery car)
'82 300D (metalic blue) sold