A woman in your apartment building owns a new model Ford Explorer and revvs the engine for 5 minutes every morning did somebody tell her this was good to do or is it bad?

Answer 1

With a new engine (less than 1,000 miles) you only have to avoid running the motor at a constant speed for a prolonged period of time. There is no "break-in" or excess idling or revving required. She may not damage the engine by running it for 5 minutes every day like this, but she's wasting fuel and wearing the motor down i might add.