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tl;dr: No. An impact wrench isn't a cure-all. The mechanic explained that sometimes lug nuts are much over torque because all shops use impact gun to tighten them. That does not cause any problem as long as they are opened using an impact wrench. Well, that's not quite true. Over-torque is bad in and of itself. At a very high level, it damages ...


I can see where your mechanic is coming from. The reason being that, although like Steve Cross notes, the impact wrench applies a lot of force suddenly, it applies the force in an evenly rotational direction. ANY wiggle in the socket (Which there will always be or you wouldn't be able to get it on the nut) and the breaker bar will be putting lateral force ...

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