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The cylinder walls glaze due to the rings not having the higher combustion pressures from being under load pushing them outward. This allows the rings and cylinders and oil to all rub each other until they are happy and polished . This glaze is a bunch of combustion by product embedded in the walls from the lack of scraping by the rings. If the engine runs fairly well when glazed - sometimes you can pull them or work them hard enough to self correct but often it requires a rebuild. If you try and work them you must watch your oil consumption as it will be higher until / if it unglazes.
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