I love my 230. It's a w110 chassis, same as the 200 but with a six cylinder engine. It is surprisingly peppy with the m180 engine and has a wonderful ride. Dead easy to work on. 18mpg or so. Many mechanical parts are available online and the Classic Center has many hard-to-find odds and ends. 13" tires will be hard to source and the rear brake shoes will have to be relined as I've never been able to find a new set.
The car appears to have Solex carbs (which is odd because it should have Zeniths based on the year) but that's good as it is a much simpler assembly and easier to rebuild/adjust. My Solexs' evaporate gas from the float bowl so it can be hard to start after sitting for a while, although with my Carter electric fuel pump I just wait until I hear air bubble out in the tank from the return line. You'll probably have issues with rubber suspension parts and various seals unless they've been serviced recently. The only things controlled with vacuum are the brake booster, the distributor advance, and the transmission. There are no lifters, but the valves could be out of adjustment. Use a 15w--40 rated diesel oil and you'll be giving the engine what it needs. There are many
grease points on the chassis and drive train.
Rust of course is something to watch out for. Floorboards, lower fenders, around the headlights, door bottoms, and a crossbrace in the front that the fenders mount to.
Even though the car is a head-turner and a real pleasure to drive, the model does not fetch much of a price. I paid $1500 two years ago for a rust-free California example and that's about at the higher end of prices even now. Introduced in 1966, it was second from the bottom in the MB lineup and can only be described as utilitarian--that's fine, it's one of the things I admire about the car. It shares most of its parts and heritage with the longer and more fully appointed w111 sedans. Check out this website:
The ECU they are referring to must be the electronic ignition (aftermarket) mounted on the firewall. That car appears real solid and mostly original. Looks to have a more recent brake booster. It would be great if you could see underneath. But you don't often see such good examples of this model on ebay.