As long as it starts easily, doesn't smoke excessively and makes good power, oil consumption
I'll qualify that a little, if it never burned oil before and now is suddenly burning lots, well that means something is wrong, possibly a broken or stuck oil control ring.
Mine burns probably close to a quart in 100 hours and I consider that normal. There is some evidence that an engine that consumes some oil, the wear rate is less. That oil is lubricating the compression
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