[HayZee518]

If you are continually replacing fixtures or receptacles, yes, I would replace it. aluminum wire is less dense than copper. copper offers less resistance than aluminum. Service entrance conductors are aluminum because once the joint is made up, it isn't disturbed or touched. aluminum oxidizes very fast and forms a protective oxide which isn't conductive. try this experiment: take a piece of aluminum wire and a piece of copper and screw it onto a receptacle screw. tighten the connection. after about a half hour, try tightening it again. you'll see the aluminum, you'll be able to take up at least another turn and a half on it whereas the copper won't budge. another half hour look at the aluminum. its getting squished - eventually it will be so malformed it will break if you flex the joint.