I went to change the oil for the first time since buying my 85 300d. Could not get the oil plug out of the pan. I nearly stripped it with a 12 point socket on a 1/2" drive ratchet (after trying a regular box wrench of course)..
I then proceeded to crank at it with a 6 point on a small socket wrench.. no go. At this point i noticed some yellowish residue around the plug.
I'm afraid to remove it now because i suspect the threads are stripped and the damn thing is glued in.
Any ideas?

I'm going to give the shop i bought it from a call... i bought the car "as is" but this is some shade tree **** that goes a bit beyond "as is" The window sticker said that they did the last oil change.

The oil pan doesn't look too hard to do, just that this is a former chicago car, so lets of potentially rusted in bolts hold it on.

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1985 Mercedes 300D turbo 144k