Here's a review on Wal-Mart oil changes from a supposedly unbiased source:
http://www.carserviceprices.com/walm...s-and-services
And, here's a video with large mouth bass fisherman, Jimmy Houston, probably created by Quaker State:
www.youtube.com/watch?v=HaXVm5JVVAw
Maybe Wal-Mart considers their 19.88 pit crew oil change to be a loss leader, and a method to get you into their store. It usually takes about 20-minutes to get it done at the Plymouth Wal-Mart if you show up at 7-am, when it first opens/7-days/week. So's for 20-30-minutes, or something, u need to kill the time while inside the Wal-Mart which is a pretty good way to get you to go shopping as long as you are there.
Like, maybe pick up a can of Delmonte tropical fruit salad, or something? Sometimes, u get lucky, and they have hamburger patties that's past it's sell date, that gets marked down to about $3.65/lb........down from 5.45.