What they say today about not needing anti-oxidant may have to do with the fact that today's "aluminum" cable is an alloy, not pure aluminum like it originally was. Today's alloys are much more stable than pure aluminum. I still use anti-oxidant, no matter what. I even use it on meter jaws to act as a lube when plugging them in. I've been known to use it on copper too in damp or corrosive environments. I really can't see the harm.
