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I would do a compression check. This will check for bad rings, and possible bad valves. If there are leaking valve seals you can have oil getting in to the cylinders. A leaky head gasket can also cause this type of issue. From what is being described, I would be considering a complete engine rebuild. Most likely damage has been done. On the rebuilt engine do a proper break in millage for at least 3500 miles, and then do the first oil change. Change the oil every 6 months or 6000 miles and use synthetic only.
 
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