I walked into a local Checker Auto to pick up a filter cap wrench when I saw a closeout table with all these quarts of SL M1 0W-20. They were marked "CLEARANCE" at $2/qt. I asked the guy behind the counter what kind of a price could I get if I took all 27. He doesn't even bat an eye and says "a buck a bottle". I'm set for the next 4 changes, or 2 for each Ford in the family.