92 plymouth acclaim oil leaking from exhaust?

Sorry this isnt truck related but i needed some answers.I want to buy a 92 plymouth acclaim from a lady who died from her son she was old and didnt drive it very much it only has 65,000 miles on it but it smokes very bad and oil is coming out of the exhaust.I dont know whats causing this.Is this a head gasket or something more.There is no oil in the anti-freeze if thats relevant.Its also an automatic.He only wants $175 for it.Its in great condition.