edit: Ok, I went and looked, only my M1EP and newer Pennzoil Platinum bottles have any star scoring chart on them.
Older Pennzoil, Valvoline, Castrol, Rotella, Delo, Havoline and Peak oil bottles do not have any stars on them.
So yeah, just a marketing thing.
When I saw this thread topic I thought we were looking at the night time stars.. or reading our astrology stuff in the news paper
I was thinking similar, how the stars align helps me make my choice of what oil I use...
about as good a way as any now days...