If it ain't broke don't fix it!
I am all for preventive maintenance and as many here know, an oil change maniac, but this regards ENGINE oil. ENGINE oil is subject to all sorts of contamination from the combustion process. Changing ENGINE oil is the only way you have to clean out this contamination.
The oil in your supercharger is NOT subject to such contamination, thus the sealed for life recommendation is very valid.
If there is a way to check to see that it still has the correct amount, then check it, see that it's full and be happy.