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CEL/MIL will never come on to remind you to do an oil change.
It could be something to do with timing, camshaft sensors, crankshaft sensors. If the performance is the same and the light has not come back on I would suspect an intermittent camshaft sensor problem, and they are cheaper to replace than the timing chain, which would probably require new tensioners if it's coming out of place. (May not even need the chain if it's the problem, but it'd be best to replace it while you're there anyway)
Out of warranty I assume?
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