One year ago, I never thought about stocking up on oil -- just go down to Walmart and pick up a 5-quart jug of Mobil 1 5w40 every 10k miles.
Then Mobil and Walmart started playing games, and I actually bought some other brands like Elf and Lubro-Moly before I decided my TDI engine really was fond of the Delvac.
I thought it was a little bit crazy to buy 30 quarts of the discontinued Truck&SUV, but felt it was better to be safe than sorry.
Then somebody mentioned some 5-gallon pails of Delvac 1 5w40 on eBay, and the seller was only 10 miles from my home.
So now I have 20 quarts of T&SUV, 5 liters of Elf, 5 liters of Lubro-Moly, and 25 gallons (100 quarts) of Delvac 1 (CI-4). 130 quarts altogether, and I only own one car that takes 5 quarts every 10k miles.
I've got buyers for a few of the 5-gallon pails. Or I just keep it all and don't buy any more oil for the next 260k miles.