Look for rust everywhere. Rockers, trunk under the rubber mat, under the windshield and back window, make sure heater blower works and AC blower (they are two separate fans). Great cars, buy the best one you can as they are not expensive and repairs can be.
^^^ good concise advice. Not sure what else to say after having owned (not restored) three of them.
Maybe add that you want the car to run nicely as the carbs are a hassle to tune if that's needed.
Not enough info. There isn't a 250 sedan that has a 2.8 l engine. It's probably a 2.5 l engine with an M114 engine. You really need the VIN (or the first 6 numbers of it). You can read a little about the W114/W115 body here:
Mercedes-Benz W114 - Wikipedia, the free encyclopedia
FWIW I believe the table that lists the engines to be incorrect.
^^^^ seems like unnecessary comment, and not true regarding the engine. The OP is correct about the m130 engine.
The only 114s to have the 2.8 have the M110 engine. And this came after '74. The 250 models will have the carbureted M130 or M114 [both the same, iirc] engine, usually with the dual carb'd zeniths.
The m130 is approximately 2.8 liters. I believe the w114 was first called a 280 around 1974 when it got the m110 engine, which is a great engine in euro form, but fairly undesirable in the solex carb North American form as I understand it. I think there was a gen1 body style sedan that got the m110 engine in 1973, but 1972 is still the m130 as I understand it.
Unsubscribe from silly discussion about which engine. Not productive. I said what I have to say - the wikipedia article is interesting as an introduction and has errors. Fonzi are whoever can decide what they are and advise the owner. I don't have a horse in this race. Later gators.
Sorry dude. Your advice on what to inspect is spot on. The engine stuff... It should be corrected, rather than leaving misinformation out here, for not only the OP, but for anyone who crosses this thread in the future.
All three w114 I've owned this year have been m130. Two long boring threads could be found by googling:
1) "Best place m130 w114 benzworld" << should bring you to a thread where I bought my first, a 1971 250 sedan that was from California with solid floors but the rockers were total Swiss cheese. It had ignition issues I worked out, plus accelerator pump issues I never tried to work out.
2) "3 little piggies m130 w114" << not a lot of work gets done in this thread but it should the sedan plus two coupes I bought. Sedan sold to Sam the w114 man near me and the coupes are still not roadworthy.
Not a lot of people drive these cars on the roads anymore. Carbs might not react well to ethanol fuel, at least not the accelerator pumps. Rust protection on these cars is pretty bad too. So it seems all the east coast cars are rotted out.
I personally think they are some great low-dollar, good-looking classics.
Oh, faded trim is very difficult to bring back. Small issue, but it give me an idea of whether the car has been loved or left in a field.