Re: Stuck Piston Rings
When you say "engine smokes", I assume you mean through the tailpipe rather than the crankcase vent. To confirm if the piston rings are at fault, dry/wet compression test will provide answers. Run the test, then inject oil into the cylinders thru the spark plug holes. If the compression reading between the tests shows an increase, the rings are likely just worn. If the tests are about the sale, your suspicion is likely true. In all. either outcome points to an engine overhaul. Additives claiming to "cure" the problem are also "blowing smoke". Any change would be temporary as shown in the wet/dry test.
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