aluminum wireing question

[gg]

I have an outlet that I want to pickup another outlet off of ,but the feed to the outlet is 12/aluminum ,then they have off the outlet 12/copper to the next outlet.I want to add another12/copper to this box ,which is plenty big enough changed that all ready.to add an out let . but that aluminum wire is confussing me, would normaly just put the feed and 2 load wires together with a wire nut and use a pigtail to feed outlet in box. but becouse it has that aluninum feed wire how should I connect these ,could I just put an antioxide grease on the alum. when I connect them? rite now the alum. is just to one screw on the outlet and the copper on the other screw. thanks for your advise.

[Tony Hwang]

Hi, There is such thing as AL/CU compatible components.

12Ga Al wire is equal to 14Ga Cu. My last house had all Al wire. Never had trouble for 20 years but > I have an outlet that I want to pickup another outlet off of ,but the feed

[Terry]

And was it not that one problem with 'Al' (aluminum/aluminium) house wiring was that even if the wires were originally put on 'dead tight' the different rate of expansion could, and did, result in some loose wiring that caused a greater chance of electrical fires. I'm thinking around 1970s?

[Martik]

There is a specific product that you coat the wires with but I can't remember the name, something like 'petrox'?