You've got some pretty good rust in the rockers around the jack holes, and rear corners. You need to get under the car and poke around, not just look, at the undercoating, particularly around mounting points and welded seams, to see if there's any real structural underbody rust, thats the big worry. I had less visible rust on my 80, but underneath it oozed orange stains from the seams, had bubbles around them here and there, it finally advanced to a point after driving it 2 years that I noticed the handling and behavior of the car was changing noticeably in bad ways, so it's parked now. I had $500 invested in it and ran it 2 yrs, still has a lot of good useable parts for my other car, not a bad haul.

BTW, you might want to carry a small hyd jack in the trunk with you, I think the factory jack will be useless to you at this point should you have a flat....

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Chris
64 190D R.I.P.
80 240D W/617 engine -for sale
82 240D -for sale