From BN:
Bronco Break-In Period
According to the owner’s manual, the 2021 Bronco does require a break-in period. For the first 1,000 mi (1,600 km), Ford recommends you avoid driving at high speeds, braking heavy, shifting aggressively, or using your vehicle to tow. Although they do not elaborate, Ford goes on to say that during this time, your vehicle may exhibit some unusual driving characteristics. This ambiguous description provides a tremendous amount of leeway for the manufacture to explain any potential gremlins inherent in some new cars.
I think what you don’t want to do with any new engine is hop in and drive hours across country at a constant speed . You want to drive at different speeds during break in period so piston and rings seat correctly.
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