Good tip about the diesel - thank you ! The ultrasound didn't loosen the top ring, so I'll give the diesel a try, and it should tell me whether the problem is burned on oil or galvanic corrosion.
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Good tip about the diesel - thank you ! The ultrasound didn't loosen the top ring, so I'll give the diesel a try, and it should tell me whether the problem is burned on oil or galvanic corrosion.