If you go to www.valvolineglobal.com you can bring the cost of Valvoline Advanced to $14.55 for 5 quarts. However you need to buy 4 20quart bay boxes and spend $291.57. In addition to the cost you need storage space for the boxes and a way to get the oil from the box to the engine.
I have a 10qt sump ... a 20 qt box sounds just fine!