Nah, there's no reason to do oil changes more often than the maintenance schedule calls for, even when new. Under either the normal or adverse schedules, he would still be at one oil change after 8k miles. Although some people believe that the oil should be changed on a new vehicle after 500-1000 miles to remove ever elusive wear metals that somehow are escaping the very effective oil filter.I should hope he did more than 1 change at 8K miles if it is a new car.
If that were really called for you can bet that the Mazda engineers would have included that in the maintenance schedule. The GM engineers sure did for the Corvette C7 when I worked for Chevy.