Walmart still has the 5-quart bottle of Mobil 1 5W-30, 5W-20, and 0W-20 Extended Performance Full Synthetic Motor Oil for $15.97 (28.97 – 3 instant savings – 4 Walmart Cash – 10 MIR) for a limited time. To get the $4 Walmart Cash, clip the digital offer before adding it to your cart and it will rebate to your account for use on your next order when the motor oil purchase is completed. Shipping is Free for Walmart+ Members or pad your order to $35 or more and score Free Shipping. The $10 mail-in-rebate ends August 31, 2026. Limit of 4 rebates per household.