Are you loosing oil? I would do a compression test. It it is low on compression, put some oil it and see if it comes up. If so you have a ring problem. If rings are good, but you are burning just a little oil, I would go after valves next. If no oil, try a new plug (could just be a bad plug) and see what it looks like after a while. If it is bad, then I bet you have an injector problem.
Maybe none of these. Hope you find it. Good luck.
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