I just wanted to let you guys who do your own oil changes know that this afternoon I was in Walmart and saw a display of 5 quart jugs of Pennzoil full synthetic oil for $20. a jug, and if you fill out and return the card attached to the jug with the original sales receipt you get a $15. Walmart gift card, so it is like getting 5 quarts of full synthetic oil for $5. There is a limit of two gift cards per family or address. These were specially marked jugs and even had a different bar code than the normal jugs, so when they are gone they are gone. I don't know if all stores are getting the displays or not and don't know if some stores are getting more than others or not, but they had 10w30, 5w30 and 5w20. I think the display only had about 8 jugs of each weight.