My 1992 300d with 201,xxx miles was totaled last year and progressive valued it at $4600, thats what I got from them and thats the cut off point they used when pricing repairs for it. I would assume that would be top end for it. That car also had no rust at all.

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1987 300D(Erma)- #14 head, 193k
2003 TDI Beetle sold
1985 300sd sold
1987 300D(Ursala)- #14 head, 157k when sold
1987 300D(Wilbur)- #14head, 356,000+miles, sold after 7 days of owning it.
1992mercedes 300d- totaled and in a junk yard somewhere..
1983 mercedes 300sd- scrapped
1980 mercedes 300sd first mercedes diesel-sold