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After
Because I change every 1000 miles because I do very short journeys and my oil gets a lot of condensation / acidity, even after 1000 miles the oil is still very good, good enough for a track day, but after I have bombed it down the track it's going to have gotten a lot of abuse, so i'd change it after and it'll be good for the next track day.
But as said, oil is cheap.
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