Just bought two 5 gallon pails of Rotella when I saw the price per pail was marked down cheaper than 5 jugs.
SAMs club. You can get 2.5 gal jugs that are easy to pour and handle. And they are only a few cents more per gallon than the 55 gal drum. I buy them for the regular oil changes and have a case of the gallon jugs to top off in between.