What do you mean by bulk?
Mobil 5000 (or any oil) is the same in a quart or a jug. But if you buy a 55 gallon drum of Mobil motor oil, it's not the same. Per the Mobil website, 5000 contains 16% more detergents than their bulk oil. By bulk, they mean an oil truck, or the barrel.
I'm not sure if Formula shell is the same in quart as it is by the truckload.