It would appear that the unit price of almost all brands of motor oil is lower if you purchase a 5 quart jug vs. buying by the quart. That being said, I am still reticent to buy by the jug because I have a 4.5 quart capacity engine and would always have .5 quarts left over. Plus, it is easier to measure out the correct amount of oil using quart bottles (especially with that nifty "window" on the side.) I am openminded about grabbing some jugs (hey, knock off that snickering) if you "jugheads" could tell me how you handle measuring the right amount and dealing with the "little extra" left over.