Hello Diesel Heads!

I am casually browsing for a car to someday replace my 1996 Dodge Neon Coupe (bought new, now 103k miles, too many oil leaks, too many bad O2 sensors, too short of life span for break rotors and pads, etc). I have a 1966 230SL that I enjoy and that has taught me something about MB engineering, therefore I'm considering an older MB sedan as a daily driver (rain, snow & salt, etc). I like the look and size of the old MB sedans as well. I read lots of posts comparing diesels (non-turbo vs. turbo, w123 vs. w116 vs. w126) and other posts describing various issues. My friend saw a good looking w123 300D Turbo for sale ($4200) that I would like to look at. I have not driven a w123 yet, nor any MB diesel. Obviously, I'll document the VIN number, engine number, option codes on the under-hood plate, and the milage. I'll also ask to see maintenance history, ask for the original data card, manuals, etc.

What should I look for, mechanically and cosmetically, when examining this model? What are signs of a neglected 300D Turbo engine? Do these rust in the typical places - front fender seams, headlights, wheel wells, trunk, etc? What should I expect for this price range?

Many thanks in advance!!!

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NOW: 2017 C43 AMG, 2006 Wrangler Unlimited Rubicon, 1966 230SL, 1980 450SL (for sale!)
PAST: 2006 C230, 1997 E300D, 1994 E420, 1994 Neon Spt Cpe, 1984 300ZX, 1983 Celica GT, 1976 Electra Limited, 1984 Honda Nighthawk 650, 1979 Suzuki PE175, 1978 Suzuki DS100
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