Yes, there were times when Al wires were used, but they have not very
nice properties. Al is amorph at normal temperatures and when
connected with screw pressure terminals, will 'flow away' making loose
connictions.

I woud recommend however also in this case a crimp connection with
standard car installation parts and checking then later every year to
see if the connection is still OK.

BTW: is the whole car wired with this kind of wires and cables?