Most Mobil products stink to me, Supertech included. Sopus products tend to be kind of rank to me too. Motorcraft used to not smell all that bad, maybe they've changed their formula since I used it last.
On contrast, most all other brands have a distinct, likable smell to me. Years before the popularity of internet info, I knew that Mobil manufactured "my" Supertech because of its distinct odor.
I guess the best smelling oil I've ever used was true green GC. I made myself dizzy snorting that junk! I'd like to get ahold of another batch some time.