That impact is not very powerful by today’s standards, and may struggle with some lug nuts. That said, it should last you a life time. Those made in Japan tools were top quality.
With age, the oil in the motors gums up, and the vanes are prone to sticking. If a few drops of oil don’t get her going, the PB air tool conditioner usualy does the trick. Just spray it in the inlet with the trigger depressed, wait a few minutes, hook her up to air and let her rip. Do cover the exhaust with a towel because it makes a crazy mess. Best to do it outside.