northen diver
Contributor
Luxfer used 6351 alloy in the manufacture of their tanks between '72 and '88, which was found to cause problems, primarily in the neck and threads (with a few cases of explosive failure).
I'm not sure I'd use an aluminum tank approaching twenty years to begin with, however, if it's a Luxfer, and it's prior to '89, you need to be especially wary...
Now, everyone's using 6061 alloy.
That having been said, I own Luxfer (al), Catalina (al), and Worthington (steel) tanks, and I'm happy with all of them (however, I'm switching to all steel from here on in - more expensive, but the upside is enormous).
A lot of air fill stations wont even fill the Luxfer tanks unless you have a VIP Plus decal on it. Even if it is post 1988.......