I change my oil at least annually just because it's a prevailing recommendation, and it's cheap and easy to do.
However, I have seen nothing to suggest that oil goes bad with age. There are no expiration dates on oil, but I suppose the additives could settle out if they are in suspension. But even then, they would mix quickly. It's been a while since I've had an oil analysis done but I don't think they adjust for pure age of oil vs engine hours.
Would be interesting to see an oil analysis on 100 engine hours at 6-mos vs 3-years.
Peter
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