No scientific info of any kind just observation. Years ago the oil change interval was 5k. If anything the engines and oils are better now than they used to be. The 3k interval seems like a gimmick. Again all anecdotal info but my Jeep is LUCKY to see an oil change at 5k and it runs great with 200k miles.
I pick up my vehicle tomorrow and will follow the manufacturer spec for the first oil change and then change between 3 - 5k.
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