Anyone know if Mobil One has changed or they are just repackaging? Anyway, they started to replace the silver tops on 0-20w with green and have done the same with 0-30w....wish they would offer a five quart 0-20w. Was at a Walmart last night and really upset with the night crew. First of all, they always shut down the self service checkout so it really takes awhile. Then as I got in an express isle, an associate decided to close it then tell me to go from a five-deep line to a ten-deep line...I made sure everyone saw me drop my quart on the way out. I expected to wait, but that was ridiculous!