Walmart has the 5-Quarts Mobil 1 Advanced Clean Full Synthetic Oil (Options include: 5W-20 / 5W-30 / OW-20) on sale for $26 with free shipping with Walmart+ (30-day trial) or on $35+. Click the checkbox to add $4 in Walmart Cash to your account, plus submit your receipt to receive a $10 virtual prepaid Mastercard by email.