I am sad to report that despite brickseeks knowledge, the closest Wallyworld in fact did not have any Castrol 0w40 or Pennzoil HM 0w20...
I checked behind all the jugs and both clearance sections...
Wife was pretty chill about it until she realized that I was having a hard time with the reality that it wasn't anywhere to be found. At that point I got some good eyerolls.
Got 5 single qts of Pennzoil Euro 0w40 for $1.50 each at the second store.
So they paid me $2.50 to take it off their hands.
Made it to the reception just in time!
Don't think twice, most folks will visit Walmart in between the ceremony and the reception. I would not be surprised at all if you see both the bride and the groom in the store then also.