I had the same question....
Hey,
Check out my post: glow plug picture - is this bad?
There is a picture of the glow plug which I pulled out from my 1987 OM603.
I wonder if your GP look similar. Let us know.
I have asked many people about it, and they say I should not worry about it.
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1987 300D Turbo, 190K miles
Renovation in progress...
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