It is a heavy duty gasket with metal around the bolt holes. I don't see why it wouldn't still be good but I'm also not an expert on the matter. Just my $.02
Even after 150 k miles? Im just concerned of it failing for whatever reason and having to do the whole shebang again because i was to lazy (or cheap) to replace it. Buuut i would rather save the money if it should still be good.
2004 Lb7
It's reuseable.
Just lube it up a bit with some transgel or other grease. Make sure to clean it good first.
You will see the damage if it is bad, then don't reinstall.
Starting my engine build piece by piece these just showed up from fingers