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Usually unders 55 or 60 mph and varied speeds. The speed of running in a new engine is really not important. The important thing is, never over rev the engine and never let the engine labour. If you avoid both of these then the engine should stay sound for many miles. modern cars don't need an elaberate break in period. Just don't be stupid and burn out alot or redline every time you shift. Drive like a sensible person for the first 15,000 miles or so. -if its diesel then run it hard. it makes the engine last longer BUT only on diesels, if its gas then take it easy but not granny style

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Q: What is the best speed should you be traveling when breaking in the car engine?
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