I am looking at a 1984 Mercedes 190D with 270K miles on it. Previous owner was pretty good at maintaining car overall. However, they are selling it because it is smoking blue under throttle. There is also a lot of blowby. I guess my question is what exactly could cause the oil to be burned in the exhaust like that. At idle there is no smoke and sometimes the engine doesn't smoke even under throttle but when it does there is clearly oil being burned in the exhaust.
The Piston Rings are bad. Try Rislone Cylinder Compression Repair. It's common for a car to have bad rings with that many miles.
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