Just received an email back from Castrol Customer Service. They are going to look into this pricing error at Walmart.
This was their reply:
Thank you for contacting Castrol North America.
The price in question for Castrol EDGE Euro Car 0W-40 A3/B4 on Walmart.com is not correct so we will reach out to Wal-Mart about the observation to have it corrected.
The Walmart.com system uses auto pricing to match the lowest market price in most cases. However, their system is not perfect so when errors like this are found, we ask them (Wal-Mart) to help fix it as soon as possible.
We appreciate you taking the time to bring this matter to our attention!
Thank you again for contacting Castrol. We value your patronage!
Sincerely,
Castrol Consumer Relations
1-800-462-0835
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Mon – Fri: 9 a.m. - 5 p.m. ET