Back in the late 70’s we started using this
for fuel line. This may be the same as what
you have bought. It was so much easier to
use than the steel line but in the beginning
we questioned whether it would hold up as
it seems to be even a little softer than copper.
Going on to forty years an there was never
a failure that we know of. You can polish
it which would simulate the nickel plating.
Cant find it in 5/16" though.
Here’s some eBay links.

https://www.ebay.com/itm/Speedway-Motor … 1438.l2649

https://www.ebay.com/itm/Challenger-Alu … 1438.l2649

It list for less on the Speedway sight but don’t know what shipping will do to the total.