Call me stupid, but I had just recently noticed that some jugs are 4 quarts and some are 5 quarts. Duh!!!
However, my question is, why would we be inclined to buy the 4 quart size????? I mean, all engines that I KNOW of take at least 4.25 or 4.5 quarts, but never exactly 4. Even the smaller 4 bangers are needing more than 4 quarts AT oil change, to include the filter. Seems kind of stupid that you have to buy a 4 quart jug and then an additional quart.......That's exactly what happened to me this weekend, had to go back to Walmart and get an extra quart. I haven't built up my oil shrine yet, baby's on the way and you know the rest of the story