The WM near me will take 5 gallons at a time. I've never had to show ID and usually just scribble some name on the sheet. I'm sure I could return the next day with another 5 gallons and nobody would care, but as we all know, every Walmart is different.Walmart only takes 5 quarts and makes you find an employee in the garage (not easy), get them to unlock the fence around the podium where they make you show ID and fill out name and address.