I also remember the oil change filler they used to use at the local Ford garage when they had metal cans.
It was an angled metal trough with five or six spikes sticking up to pierce the cans, and a spout coming down from one end. You put the spout in the oil filler in the valve cover, and then pushed the oil cans down onto the spikes in the trough. As each can was pierced the oil ran down the trough and into the engine. When you got done it was easy to know how much oil you added because there would be five cans stuck on the spikes on the filler.