Service schedules for vehicles in the US always used to be based on useage profile and not a fixed time limit. If it is classed as "heavy duty" ie. in one of the hot southern states with lots of stop/start journeys, like taxis or cop cars, then it's every 3000 miles. Anything else and it's 6000 miles or more.
As TnE mentioned, oil and filter changes are dirt cheap, even fully synth, and it's done in the time it takes you to drink a soda or coffee.
When I bought my Chevy in Texas it came from the factory filled with dino oil for the first 1500 miles which was swapped to fully synth at the first service and every 6000 miles thereafter.
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