We used this compressor with a 1/2-inch impact wrench for testing purposes, which required 6 CFM of air volume at 90 PSI. But the compressor air emitting capacity was less than the requirements. As a result, the compressor kept me up for a while, which was relatively enough to remove 5 lug nuts at once. We had to wait until the tank pressure reached its maximum level.    So, this 6-gallon compressor is not ideal for running an impact wrench continuously. I recommend a bigger air compressor with a large tank and air emitting capacity for these air-hungry auto repair tools.