I bought several 5-qt jugs M1 AFE 0W20 from Walmart last couple years. I like the 5-qt jug mainly because lower price, about $5/qt compares with $6.xx/qt in quart bottle.
Most auto parts chains have various grades in 5.1-qt jugs, my local O'Reilly has M1 0W20 in 5.1-qt jugs, but their regular price is much higher than WM.