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I think many people change at 500 because new engines shed the most metal very early in the break in period but that wasnt in my manual or at least I didnt see it.
Personally, I changed just the oil filter in my 2020 ZLE at 500 miles, then the oil and filter at 1500 miles. I never go under about 50% life on my oil changes ever since the first oil change.
I also changed the differential oil at 1000. The diff oil was very dark with lots of metalic in it. I changed it again after another few thousand miles and a day at the track.
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