I have 2 '83s . both are a joy to own ,never had any problems that I could not take care of. One important thing to look at is the front and rear windshield seal.I have not found one yet that doesn't leak in the corners . Pull out the floor mats and carpet all the way down to the floor insulation to be sure. If you find water look underneith the car to see if the floor is rotted. The under coating always seems to hold everything together until the floor develops a hole AKA A DRAIN
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'83 240D 264k

on 100% biodiesel/ 31mpg
83 300D 217K

the $800 gem
'82 300D 267K the new WVO project car

finished and driving for free

International tractor B275 on B100
Ford 555 backhoe on B100
Sargent 25 ton Rough Terrain crane on B50