According to Molakule, mineral paraffinic base oil, any group.
http://www.bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=257884
But my guess is Grp III. Same goes for Motul 300V series, you see these "hydro this, hydro that, petroleum...etc). Just wonder their "100-synthetic"...