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Select Mobil 1 Motor Oils drop to $22.47 at Walmart.com. Shipping is $2.97. This is the lowest price we found by $15. For example, we selected this Mobil 1 0W-20 Advanced Fuel Economy Full Synthetic Motor Oil for $22.47, which claims to increase engine efficiency and improve fuel economy up to 2 percent. Sales tax is charged in most states.